date: Tue Jan 15 09:13:20 2008
from: Phil Jones <p.jones@uea.ac.uk>
subject: Re: HADCRUT3 data
to: Phil Green <phil@greenbridge.com>

    Phil,
       Have you looked at the papers that are on our temperature page? These
    have some of the details. Most of the issues you rise have been discussed
    in these or earlier papers.
       For the 1950s (1951-60) WMO through its 10-year books issued a
    lot more station data than they had in the 1940s. These continued for
    the 1960s, 1970s, 1980s and 1990s. These only get issued at the
    end of each decade. It isn't at the end, but often about 5 years
    afterwards. The 1990s were issued a couple of years ago. We add these
    data in when they become available. All these sets of 10-year books
    are put together by NCDC in Asheville, NC for WMO. WMO sends out letters
    to each National Met Service, but they take years sending in any data for some
    countries.
      The drop at the end of 1996 is due almost entirely to fewer US stations. As
    we already have more stations per area in the US than almost anywhere else
    (except a few European countries), we haven't bothered updating the US series.
    I suspect that it is Nov/Dec 1996 because of when we added more US stations.
    We still have more US stations per unit area than anywhere else - even in 2007.
      So, this is all a case of data access and not loads of stations stopping at some
    point (e.g. 1996) or starting (1950). I suspect that the 1951 was more stations
    starting around the 1945-50 period, but access to a lot of data in the 1940s was poor.
    This was worse for SST data for obvious reasons.
     There was a little bit of a decrease is surface station reporting in the 1990s, but this
    is partly political and partly logistic. First changes in fUSSR reduced stations
    there, but it is improving a little recently. Even now numbers aren't as bad as some
    other regions in the tropics, but we did have a good dataset from fUSSR up to the late
   1980s.
    Russia is still better and consistent than lots of other countries (e.g. Brazil).
    Elsewhere - in developed countries, automation has come. Many countries give these sites
    new station ids, but they are often at the same locations as the manned sites. It takes us
   a while to locate these, as WMO don't issue new ids that frequently - what they call
    volume A.
    Some countries occasionally issue a lot of back data, which we add, but then don't
    issue so many sites in real time. We do better keeping track of this for English speaking
    countries.
    Most countries have loads more stations than the issue, so the US isn't unique in this.
    I recently saw a Chinese average based on 700+ sites from 1951. We only get about 60
    sites from China each month. 60 is enough though for us.
    Hope this helps.
    Phil
   At 22:41 14/01/2008, you wrote:

     Dear Dr Jones:
     I am writing a general interest book on measurement and its difficulties, and one of my
     chapters deals with measuring global (or hemispheric) temperature means. I recently
     downloaded the Hadcrut3 database and analysed it in a variety of ways to gain a better
     understanding. John Kennedy subsequently sent me some data (attached) on the number of
     stations that were reporting every year and month. I had some questions for him but he
     suggested you would be a greater authority on this topic. I hope you will feel these
     questions worthy of a response.
     I attach a chart of the number of land stations per month. There are several instances
     where at year-end the number of stations reporting jumps up or down. For example, in
     1950-12 there were 2,973 stations; in 1951-1 there are 3,443; a one month jump of almost
     500 stations. Likewise in 1996-11 there are 2,708 stations and then 1996-12 there are
     1,831 : a drop of almost 900 stations. I have indicated a few more such jumps or drops
     with arrows. All occur between Dec and Jan, except 1996 which occurs between Nov and
     Dec.
     1. If you could clarify this pattern for me I'd be most grateful.
     2. Do I understand correctly that the decreasing number of stations seen from 1990
     onwards is a not an indication of the number of physical land stations, but of the
     problems of collecting the data and entering it into your database? or is there an
     actual decrease in the number of reporting stations from 1990 onwards? It is this latter
     point which I am most anxious to clarify, as one would expect the opposite.
     Gratefully yours,
     Pihl Green
     --
     Philip Green
     President
     Greenbridge Management Inc.
     905-271-6262
     [1]http://www.greenbridge.com
     1850   1         110        1895
     1850   2         109        2010
     1850   3         110        2238
     1850   4         108        2305
     1850   5         109        2255
     1850   6         109        2389
     1850   7         111        2456
     1850   8         110        2625
     1850   9         110        2116
     1850  10         112        1896
     1850  11         112        1981
     1850  12         112        2029
     1851   1         127        1948
     1851   2         128        1917
     1851   3         128        1733
     1851   4         127        1779
     1851   5         126        1828
     1851   6         127        1815
     1851   7         124        1854
     1851   8         125        2209
     1851   9         122        1716
     1851  10         125        1514
     1851  11         125        1428
     1851  12         127        1540
     1852   1         132        1541
     1852   2         131        1766
     1852   3         133        1829
     1852   4         133        2069
     1852   5         133        2159
     1852   6         131        2279
     1852   7         131        2049
     1852   8         132        1987
     1852   9         132        1800
     1852  10         132        2113
     1852  11         132        2078
     1852  12         133        2101
     1853   1         129        2246
     1853   2         129        2782
     1853   3         130        3086
     1853   4         127        2876
     1853   5         128        3097
     1853   6         129        3157
     1853   7         127        3194
     1853   8         127        3409
     1853   9         126        2685
     1853  10         127        2564
     1853  11         128        2361
     1853  12         130        2570
     1854   1         142        2427
     1854   2         139        2743
     1854   3         140        3199
     1854   4         138        2884
     1854   5         140        3499
     1854   6         140        4017
     1854   7         141        4429
     1854   8         143        6764
     1854   9         143        5589
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     1854  12         145        5770
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     1856   1         164        5421
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     1893  11        1016       15220
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     1894   2        1020       13873
     1894   3        1021       15005
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     1894   5        1069       16186
     1894   6        1067       14087
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     1895   9        1138       18857
     1895  10        1156       19758
     1895  11        1140       18070
     1895  12        1145       16916
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     1896   3        1173       17181
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     1896   6        1191       19887
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     1897   5        1240       18295
     1897   6        1231       17734
     1897   7        1228       17136
     1897   8        1232       18249
     1897   9        1233       17453
     1897  10        1235       16275
     1897  11        1225       15842
     1897  12        1232       15413
     1898   1        1253       15837
     1898   2        1258       16780
     1898   3        1266       17260
     1898   4        1260       16586
     1898   5        1269       15843
     1898   6        1269       17641
     1898   7        1270       19871
     1898   8        1261       22885
     1898   9        1274       17996
     1898  10        1276       18805
     1898  11        1263       18482
     1898  12        1267       18546
     1899   1        1275       17903
     1899   2        1284       17276
     1899   3        1281       18394
     1899   4        1285       17277
     1899   5        1296       18002
     1899   6        1295       18983
     1899   7        1286       16866
     1899   8        1291       17648
     1899   9        1301       14420
     1899  10        1304       16023
     1899  11        1295       17780
     1899  12        1289       15956
     1900   1        1343       12471
     1900   2        1346       12931
     1900   3        1363       14554
     1900   4        1367       14680
     1900   5        1372       14708
     1900   6        1361       13297
     1900   7        1360       12886
     1900   8        1359       14930
     1900   9        1359       14646
     1900  10        1361       14049
     1900  11        1351       13455
     1900  12        1364       13362
     1901   1        1392       13900
     1901   2        1405       16634
     1901   3        1394       14471
     1901   4        1394       13094
     1901   5        1404       13749
     1901   6        1399       13003
     1901   7        1396       14452
     1901   8        1398       17641
     1901   9        1402       15810
     1901  10        1409       15693
     1901  11        1401       15964
     1901  12        1408       16232
     1902   1        1440       14727
     1902   2        1434       18816
     1902   3        1428       20876
     1902   4        1434       22208
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     1902   6        1443       22890
     1902   7        1431       21552
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     1902  10        1441       24116
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     1903   1        1470       20200
     1903   2        1472       20881
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     1903   6        1475       24229
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     1903   8        1472       28750
     1903   9        1470       22882
     1903  10        1476       24005
     1903  11        1479       24663
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     1904   1        1504       23627
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     1904   3        1516       27680
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     1904   5        1534       28883
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     1904   7        1513       28051
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     1904   9        1514       31326
     1904  10        1511       31880
     1904  11        1514       31055
     1904  12        1521       30336
     1905   1        1553       29707
     1905   2        1557       29227
     1905   3        1559       30685
     1905   4        1552       32192
     1905   5        1560       31485
     1905   6        1560       31833
     1905   7        1550       32840
     1905   8        1548       38595
     1905   9        1564       34557
     1905  10        1560       34069
     1905  11        1566       34704
     1905  12        1560       33052
     1906   1        1585       32912
     1906   2        1592       36645
     1906   3        1598       33237
     1906   4        1580       32998
     1906   5        1592       33866
     1906   6        1592       34706
     1906   7        1583       35925
     1906   8        1581       41768
     1906   9        1590       33351
     1906  10        1587       33417
     1906  11        1587       34395
     1906  12        1594       31347
     1907   1        1657       29874
     1907   2        1656       31736
     1907   3        1658       33493
     1907   4        1667       33516
     1907   5        1660       34581
     1907   6        1666       34007
     1907   7        1661       38451
     1907   8        1660       46384
     1907   9        1670       38173
     1907  10        1667       36272
     1907  11        1675       39276
     1907  12        1680       37333
     1908   1        1697       35250
     1908   2        1705       39193
     1908   3        1688       39226
     1908   4        1689       38996
     1908   5        1697       37553
     1908   6        1695       37015
     1908   7        1696       40706
     1908   8        1706       49406
     1908   9        1706       41348
     1908  10        1700       40682
     1908  11        1710       40414
     1908  12        1709       39096
     1909   1        1748       37631
     1909   2        1756       41300
     1909   3        1749       41212
     1909   4        1745       42292
     1909   5        1736       43212
     1909   6        1746       43374
     1909   7        1740       46622
     1909   8        1745       54575
     1909   9        1746       47017
     1909  10        1744       47417
     1909  11        1752       48628
     1909  12        1753       47612
     1910   1        1788       47644
     1910   2        1787       46844
     1910   3        1793       48630
     1910   4        1796       49503
     1910   5        1789       52616
     1910   6        1790       52234
     1910   7        1781       54417
     1910   8        1794       62702
     1910   9        1789       56000
     1910  10        1788       57377
     1910  11        1777       54563
     1910  12        1791       55234
     1911   1        1820       55768
     1911   2        1830       53355
     1911   3        1819       55890
     1911   4        1824       54025
     1911   5        1823       57810
     1911   6        1826       54737
     1911   7        1828       57341
     1911   8        1826       68342
     1911   9        1832       54584
     1911  10        1843       56562
     1911  11        1833       56786
     1911  12        1843       54854
     1912   1        1862       52208
     1912   2        1870       52546
     1912   3        1868       51982
     1912   4        1868       54835
     1912   5        1863       54769
     1912   6        1869       53957
     1912   7        1866       57524
     1912   8        1870       64488
     1912   9        1863       56839
     1912  10        1871       57017
     1912  11        1881       56610
     1912  12        1884       58321
     1913   1        1905       67672
     1913   2        1906       69820
     1913   3        1914       71478
     1913   4        1920       67577
     1913   5        1911       66959
     1913   6        1921       67895
     1913   7        1899       69480
     1913   8        1909       79888
     1913   9        1908       67550
     1913  10        1910       66264
     1913  11        1917       67492
     1913  12        1923       65864
     1914   1        1967       62346
     1914   2        1955       64480
     1914   3        1948       61978
     1914   4        1945       56283
     1914   5        1955       52789
     1914   6        1960       47479
     1914   7        1950       36715
     1914   8        1961       24746
     1914   9        1966       17661
     1914  10        1972       19641
     1914  11        1971       21382
     1914  12        1966       20156
     1915   1        1968       21045
     1915   2        1972       22900
     1915   3        1969       24118
     1915   4        1966       23425
     1915   5        1960       23864
     1915   6        1965       24569
     1915   7        1967       22414
     1915   8        1964       26990
     1915   9        1973       23725
     1915  10        1975       23501
     1915  11        1978       23833
     1915  12        1975       23158
     1916   1        1988       22238
     1916   2        1992       23786
     1916   3        1985       22956
     1916   4        1985       21098
     1916   5        1980       21599
     1916   6        1986       21835
     1916   7        1993       20411
     1916   8        1984       25898
     1916   9        1992       21309
     1916  10        1999       21075
     1916  11        1980       21426
     1916  12        1989       20607
     1917   1        2010       18841
     1917   2        2003       17297
     1917   3        2002       17588
     1917   4        2010       17369
     1917   5        2003       17875
     1917   6        2006       17923
     1917   7        2010       18037
     1917   8        2008       19654
     1917   9        2010       16727
     1917  10        1997       16211
     1917  11        1990       15774
     1917  12        2000       14595
     1918   1        2007       13785
     1918   2        2013       13355
     1918   3        2011       12763
     1918   4        2020       10487
     1918   5        2021       11282
     1918   6        2010       12143
     1918   7        2006       12436
     1918   8        2015       15261
     1918   9        2008       11796
     1918  10        2003       12159
     1918  11        1985       11588
     1918  12        1993       10961
     1919   1        2002       11972
     1919   2        2014       12642
     1919   3        2010       14250
     1919   4        2013       13302
     1919   5        2015       15645
     1919   6        2020       17283
     1919   7        2011       16111
     1919   8        2010       16135
     1919   9        2001       14870
     1919  10        1975       18732
     1919  11        1983       19738
     1919  12        2002       17756
     1920   1        2000       15914
     1920   2        2013       18090
     1920   3        2010       14784
     1920   4        2007       16036
     1920   5        2005       17323
     1920   6        2014       18143
     1920   7        2002       21347
     1920   8        2010       26829
     1920   9        2002       22764
     1920  10        1994       24056
     1920  11        1989       24183
     1920  12        2016       25945
     1921   1        2052       24277
     1921   2        2066       26450
     1921   3        2059       26821
     1921   4        2056       30007
     1921   5        2063       31189
     1921   6        2063       29479
     1921   7        2063       31124
     1921   8        2064       38134
     1921   9        2065       33945
     1921  10        2069       32406
     1921  11        2057       34400
     1921  12        2062       32406
     1922   1        2073       29168
     1922   2        2074       32994
     1922   3        2079       35577
     1922   4        2087       36988
     1922   5        2077       37013
     1922   6        2075       38495
     1922   7        2075       38286
     1922   8        2089       45046
     1922   9        2090       39024
     1922  10        2089       39034
     1922  11        2092       42238
     1922  12        2088       41181
     1923   1        2110       39639
     1923   2        2097       44201
     1923   3        2105       44290
     1923   4        2105       44425
     1923   5        2116       44364
     1923   6        2122       45525
     1923   7        2118       46707
     1923   8        2122       51109
     1923   9        2125       44642
     1923  10        2134       44929
     1923  11        2129       45135
     1923  12        2124       43684
     1924   1        2134       44271
     1924   2        2139       48545
     1924   3        2134       48575
     1924   4        2136       48842
     1924   5        2128       48896
     1924   6        2135       48698
     1924   7        2134       46589
     1924   8        2134       54246
     1924   9        2138       47970
     1924  10        2144       49141
     1924  11        2133       49051
     1924  12        2132       45129
     1925   1        2156       45606
     1925   2        2172       46917
     1925   3        2170       45552
     1925   4        2162       45038
     1925   5        2169       45580
     1925   6        2170       44068
     1925   7        2163       43835
     1925   8        2172       53039
     1925   9        2167       45025
     1925  10        2176       48063
     1925  11        2169       47146
     1925  12        2163       44440
     1926   1        2198       41963
     1926   2        2190       47833
     1926   3        2194       46015
     1926   4        2199       45060
     1926   5        2202       44515
     1926   6        2208       45764
     1926   7        2211       47829
     1926   8        2211       57593
     1926   9        2219       49392
     1926  10        2205       51956
     1926  11        2204       52095
     1926  12        2211       49493
     1927   1        2228       49103
     1927   2        2227       53022
     1927   3        2229       54117
     1927   4        2221       54306
     1927   5        2222       55076
     1927   6        2218       52813
     1927   7        2224       55858
     1927   8        2209       64351
     1927   9        2230       53877
     1927  10        2225       54194
     1927  11        2225       55598
     1927  12        2229       51885
     1928   1        2251       49054
     1928   2        2244       52608
     1928   3        2230       51709
     1928   4        2244       51080
     1928   5        2248       52557
     1928   6        2241       51775
     1928   7        2247       52559
     1928   8        2251       63574
     1928   9        2239       53749
     1928  10        2240       52527
     1928  11        2245       54384
     1928  12        2242       51838
     1929   1        2262       47802
     1929   2        2265       50031
     1929   3        2275       50678
     1929   4        2278       51768
     1929   5        2270       51809
     1929   6        2271       52420
     1929   7        2270       56018
     1929   8        2266       63530
     1929   9        2279       53019
     1929  10        2273       54189
     1929  11        2270       52712
     1929  12        2271       48910
     1930   1        2276       46282
     1930   2        2287       49226
     1930   3        2291       47187
     1930   4        2296       49936
     1930   5        2293       48641
     1930   6        2300       47961
     1930   7        2298       46593
     1930   8        2298       53748
     1930   9        2286       47391
     1930  10        2299       46859
     1930  11        2283       44842
     1930  12        2294       42708
     1931   1        2352       39678
     1931   2        2344       41885
     1931   3        2353       41931
     1931   4        2351       41320
     1931   5        2354       42941
     1931   6        2361       42437
     1931   7        2363       41474
     1931   8        2358       47082
     1931   9        2355       37944
     1931  10        2353       37388
     1931  11        2351       36683
     1931  12        2350       33083
     1932   1        2366       30362
     1932   2        2365       32447
     1932   3        2363       32316
     1932   4        2357       30677
     1932   5        2365       31340
     1932   6        2376       29604
     1932   7        2362       29811
     1932   8        2378       32757
     1932   9        2383       30040
     1932  10        2379       29117
     1932  11        2377       30062
     1932  12        2377       29504
     1933   1        2389       40658
     1933   2        2391       42751
     1933   3        2396       43762
     1933   4        2394       45871
     1933   5        2401       42591
     1933   6        2407       43656
     1933   7        2399       45091
     1933   8        2397       52950
     1933   9        2393       47461
     1933  10        2401       47918
     1933  11        2391       49553
     1933  12        2383       43903
     1934   1        2404       47016
     1934   2        2400       48267
     1934   3        2397       50046
     1934   4        2401       47600
     1934   5        2403       48745
     1934   6        2404       49112
     1934   7        2396       50119
     1934   8        2400       57685
     1934   9        2401       51358
     1934  10        2401       49885
     1934  11        2409       49083
     1934  12        2398       47244
     1935   1        2406       47352
     1935   2        2407       50066
     1935   3        2404       53043
     1935   4        2399       51040
     1935   5        2404       51958
     1935   6        2399       53292
     1935   7        2409       56620
     1935   8        2419       69161
     1935   9        2417       62316
     1935  10        2411       63398
     1935  11        2402       62526
     1935  12        2404       59317
     1936   1        2457       60448
     1936   2        2428       63749
     1936   3        2462       63971
     1936   4        2459       62759
     1936   5        2458       66628
     1936   6        2460       64996
     1936   7        2453       67259
     1936   8        2457       78043
     1936   9        2472       66318
     1936  10        2466       66098
     1936  11        2458       63768
     1936  12        2460       59094
     1937   1        2463       62249
     1937   2        2476       66325
     1937   3        2472       67010
     1937   4        2478       66078
     1937   5        2484       68150
     1937   6        2487       69060
     1937   7        2492       69212
     1937   8        2490       77139
     1937   9        2485       64488
     1937  10        2486       62857
     1937  11        2465       62009
     1937  12        2465       58657
     1938   1        2502       58085
     1938   2        2500       60942
     1938   3        2507       61706
     1938   4        2520       62277
     1938   5        2521       61085
     1938   6        2520       61676
     1938   7        2514       62374
     1938   8        2520       68586
     1938   9        2522       56121
     1938  10        2510       54870
     1938  11        2512       51910
     1938  12        2511       50689
     1939   1        2545       52558
     1939   2        2548       52030
     1939   3        2550       50174
     1939   4        2558       50165
     1939   5        2562       48562
     1939   6        2553       49842
     1939   7        2562       47713
     1939   8        2563       48737
     1939   9        2563       29972
     1939  10        2562       29318
     1939  11        2560       27818
     1939  12        2564       27441
     1940   1        2567       28514
     1940   2        2579       29274
     1940   3        2583       27319
     1940   4        2586       27547
     1940   5        2593       28077
     1940   6        2593       29196
     1940   7        2591       29605
     1940   8        2597       36229
     1940   9        2598       28524
     1940  10        2600       28485
     1940  11        2591       27613
     1940  12        2595       26278
     1941   1        2649       30422
     1941   2        2657       32895
     1941   3        2665       32502
     1941   4        2659       31618
     1941   5        2663       31226
     1941   6        2662       33787
     1941   7        2665       32047
     1941   8        2652       34242
     1941   9        2652       24556
     1941  10        2661       24823
     1941  11        2665       20372
     1941  12        2658        6377
     1942   1        2676        9057
     1942   2        2675        8851
     1942   3        2676        9141
     1942   4        2680        9741
     1942   5        2677        9882
     1942   6        2680        8688
     1942   7        2673        8018
     1942   8        2663        9263
     1942   9        2659        6888
     1942  10        2667        7182
     1942  11        2664        7409
     1942  12        2667        5471
     1943   1        2690        6317
     1943   2        2680        7930
     1943   3        2688        7737
     1943   4        2677        7696
     1943   5        2670        8902
     1943   6        2691        9392
     1943   7        2691       10389
     1943   8        2687       12103
     1943   9        2686       10812
     1943  10        2691        9758
     1943  11        2678       10078
     1943  12        2691       10473
     1944   1        2702       11855
     1944   2        2700       13209
     1944   3        2690       13493
     1944   4        2697       13447
     1944   5        2705       14400
     1944   6        2711       16558
     1944   7        2695       16365
     1944   8        2698       20256
     1944   9        2707       17134
     1944  10        2708       16728
     1944  11        2708       15216
     1944  12        2715       14298
     1945   1        2714       16195
     1945   2        2723       17435
     1945   3        2729       21531
     1945   4        2715       27091
     1945   5        2715       28044
     1945   6        2728       30654
     1945   7        2718       29058
     1945   8        2726       33397
     1945   9        2738       30647
     1945  10        2737       29362
     1945  11        2731       30493
     1945  12        2734       29978
     1946   1        2764       21038
     1946   2        2754       15471
     1946   3        2760       13423
     1946   4        2760       15720
     1946   5        2753       14921
     1946   6        2758       14287
     1946   7        2762       16645
     1946   8        2762       19664
     1946   9        2760       17655
     1946  10        2770       18754
     1946  11        2777       18388
     1946  12        2767       16741
     1947   1        2796       17919
     1947   2        2808       19885
     1947   3        2804       20161
     1947   4        2793       20709
     1947   5        2800       22214
     1947   6        2800       23757
     1947   7        2797       23489
     1947   8        2808       26023
     1947   9        2807       22333
     1947  10        2808       20453
     1947  11        2811       20515
     1947  12        2818       20329
     1948   1        2839       21248
     1948   2        2844       23115
     1948   3        2840       25465
     1948   4        2847       25104
     1948   5        2831       28012
     1948   6        2846       27132
     1948   7        2838       28875
     1948   8        2834       32592
     1948   9        2850       29505
     1948  10        2854       28279
     1948  11        2863       29406
     1948  12        2868       23245
     1949   1        2890       31375
     1949   2        2888       36145
     1949   3        2887       38425
     1949   4        2890       35366
     1949   5        2883       37909
     1949   6        2886       38210
     1949   7        2890       40682
     1949   8        2884       49560
     1949   9        2878       40059
     1949  10        2896       40399
     1949  11        2903       36715
     1949  12        2900       31319
     1950   1        2959       30500
     1950   2        2954       34413
     1950   3        2957       35873
     1950   4        2970       34858
     1950   5        2969       36910
     1950   6        2965       42268
     1950   7        2972       38391
     1950   8        2981       46371
     1950   9        2981       36665
     1950  10        2974       39079
     1950  11        2980       37783
     1950  12        2973       36352
     1951   1        3443       39472
     1951   2        3439       45228
     1951   3        3434       46011
     1951   4        3435       46443
     1951   5        3453       45493
     1951   6        3456       41831
     1951   7        3461       42742
     1951   8        3475       53897
     1951   9        3485       46829
     1951  10        3484       43847
     1951  11        3495       44075
     1951  12        3489       44040
     1952   1        3516       43927
     1952   2        3522       50880
     1952   3        3518       49936
     1952   4        3525       49498
     1952   5        3525       49857
     1952   6        3541       53832
     1952   7        3542       52794
     1952   8        3529       63560
     1952   9        3537       53909
     1952  10        3536       52147
     1952  11        3542       48887
     1952  12        3535       46964
     1953   1        3560       49540
     1953   2        3566       53694
     1953   3        3564       54372
     1953   4        3571       57834
     1953   5        3581       61735
     1953   6        3581       62883
     1953   7        3578       64028
     1953   8        3579       76800
     1953   9        3570       64583
     1953  10        3577       64218
     1953  11        3585       60909
     1953  12        3589       59200
     1954   1        3593       55437
     1954   2        3598       58774
     1954   3        3589       60527
     1954   4        3585       59221
     1954   5        3589       63695
     1954   6        3605       64968
     1954   7        3589       63753
     1954   8        3593       73439
     1954   9        3605       63054
     1954  10        3602       62248
     1954  11        3606       61566
     1954  12        3606       58935
     1955   1        3627       59446
     1955   2        3617       63914
     1955   3        3623       65207
     1955   4        3634       64049
     1955   5        3628       66041
     1955   6        3627       66892
     1955   7        3635       67103
     1955   8        3645       82178
     1955   9        3621       70525
     1955  10        3633       70241
     1955  11        3618       73050
     1955  12        3631       68388
     1956   1        3647       66341
     1956   2        3646       71145
     1956   3        3640       73195
     1956   4        3635       75212
     1956   5        3649       75636
     1956   6        3650       77370
     1956   7        3649       78181
     1956   8        3649       95343
     1956   9        3647       79752
     1956  10        3660       78668
     1956  11        3654       82447
     1956  12        3650       78563
     1957   1        3637       76980
     1957   2        3630       84348
     1957   3        3649       88429
     1957   4        3645       85826
     1957   5        3642       89327
     1957   6        3644       91524
     1957   7        3645       91178
     1957   8        3648      107763
     1957   9        3637       93257
     1957  10        3646       89325
     1957  11        3647       91803
     1957  12        3647       85482
     1958   1        3658       82031
     1958   2        3655       86666
     1958   3        3645       89156
     1958   4        3654       90288
     1958   5        3649       96446
     1958   6        3650       95906
     1958   7        3659       96679
     1958   8        3654      113770
     1958   9        3658       95068
     1958  10        3661       93729
     1958  11        3653       93905
     1958  12        3654       86841
     1959   1        3663       89246
     1959   2        3664       95469
     1959   3        3668       96770
     1959   4        3668       93615
     1959   5        3663       99812
     1959   6        3660      103846
     1959   7        3667      103597
     1959   8        3683      122355
     1959   9        3674      101648
     1959  10        3664      100892
     1959  11        3658      102832
     1959  12        3670       97362
     1960   1        3698       94566
     1960   2        3705      103264
     1960   3        3700      103923
     1960   4        3704      101490
     1960   5        3712      103786
     1960   6        3708      107944
     1960   7        3698      107083
     1960   8        3703      125010
     1960   9        3715      107504
     1960  10        3726      107936
     1960  11        3735      107677
     1960  12        3720      101229
     1961   1        3763       96203
     1961   2        3763      103063
     1961   3        3773      103095
     1961   4        3764      103842
     1961   5        3786      104685
     1961   6        3795      103170
     1961   7        3766       92255
     1961   8        3766      114271
     1961   9        3768       98259
     1961  10        3784       94760
     1961  11        3776       94532
     1961  12        3757       90244
     1962   1        3825       95543
     1962   2        3819      101143
     1962   3        3814      103861
     1962   4        3780      100242
     1962   5        3810      103590
     1962   6        3815       88409
     1962   7        3791       85440
     1962   8        3851       96062
     1962   9        3836       83533
     1962  10        3828       84251
     1962  11        3832       84496
     1962  12        3828       76418
     1963   1        3855       86131
     1963   2        3862       95493
     1963   3        3863      105605
     1963   4        3868      105736
     1963   5        3867      108496
     1963   6        3875      104510
     1963   7        3869      102932
     1963   8        3875      122201
     1963   9        3886      103186
     1963  10        3868      102887
     1963  11        3869      101202
     1963  12        3880       95444
     1964   1        3869      118582
     1964   2        3892      129125
     1964   3        3897      132471
     1964   4        3882      130855
     1964   5        3879      135637
     1964   6        3881      139095
     1964   7        3885      135885
     1964   8        3875      161849
     1964   9        3879      137592
     1964  10        3888      136241
     1964  11        3878      136121
     1964  12        3866      124348
     1965   1        3922      131164
     1965   2        3937      135920
     1965   3        3926      144510
     1965   4        3921      148274
     1965   5        3921      153689
     1965   6        3915      153188
     1965   7        3918      150252
     1965   8        3906      178342
     1965   9        3914      147018
     1965  10        3916      146068
     1965  11        3913      141209
     1965  12        3918      133084
     1966   1        3917      138551
     1966   2        3949      150490
     1966   3        3945      151099
     1966   4        3936      149882
     1966   5        3938      152200
     1966   6        3953      155021
     1966   7        3959      163084
     1966   8        3963      187009
     1966   9        3966      156376
     1966  10        3975      158476
     1966  11        3977      162293
     1966  12        3965      148478
     1967   1        3978      154138
     1967   2        3979      176653
     1967   3        3972      177696
     1967   4        3968      175069
     1967   5        3973      174241
     1967   6        3970      182869
     1967   7        3987      187735
     1967   8        3980      223594
     1967   9        3985      184215
     1967  10        3983      186129
     1967  11        3969      181280
     1967  12        3949      168222
     1968   1        3958      156703
     1968   2        3967      176855
     1968   3        3979      174413
     1968   4        3972      178784
     1968   5        3958      184972
     1968   6        3987      180622
     1968   7        3980      183281
     1968   8        3967      213844
     1968   9        3963      185344
     1968  10        3979      182072
     1968  11        3968      176684
     1968  12        3952      166109
     1969   1        3971      160494
     1969   2        3989      175888
     1969   3        3979      173946
     1969   4        3978      177411
     1969   5        4002      176177
     1969   6        3992      184293
     1969   7        3997      177853
     1969   8        3999      199448
     1969   9        4000      169662
     1969  10        3997      167169
     1969  11        3984      166907
     1969  12        3979      148030
     1970   1        3955      151054
     1970   2        3966      160115
     1970   3        3962      165828
     1970   4        3979      165680
     1970   5        3955      171550
     1970   6        3975      176483
     1970   7        3963      170304
     1970   8        3955      194643
     1970   9        3967      171414
     1970  10        3977      169081
     1970  11        3980      167065
     1970  12        3981      155317
     1971   1        3794      139643
     1971   2        3775      156001
     1971   3        3778      165288
     1971   4        3769      162410
     1971   5        3774      164824
     1971   6        3774      163522
     1971   7        3785      152986
     1971   8        3785      179145
     1971   9        3812      150976
     1971  10        3798      150079
     1971  11        3773      146618
     1971  12        3746      135448
     1972   1        3790      142741
     1972   2        3777      145114
     1972   3        3767      153029
     1972   4        3735      154702
     1972   5        3725      149918
     1972   6        3748      152224
     1972   7        3730      152751
     1972   8        3725      177832
     1972   9        3712      156078
     1972  10        3708      153731
     1972  11        3685      150005
     1972  12        3700      139159
     1973   1        3747      140300
     1973   2        3750      153177
     1973   3        3739      147493
     1973   4        3726      143310
     1973   5        3712      151416
     1973   6        3717      165624
     1973   7        3715      157355
     1973   8        3746      181338
     1973   9        3709      157935
     1973  10        3689      151996
     1973  11        3667      141316
     1973  12        3666      134032
     1974   1        3730      128821
     1974   2        3748      146603
     1974   3        3731      147450
     1974   4        3744      142084
     1974   5        3714      148338
     1974   6        3739      139372
     1974   7        3708      137943
     1974   8        3712      184067
     1974   9        3699      139225
     1974  10        3702      150930
     1974  11        3687      148514
     1974  12        3645      139847
     1975   1        3680      134488
     1975   2        3697      155015
     1975   3        3659      150421
     1975   4        3686      151212
     1975   5        3680      154900
     1975   6        3710      159852
     1975   7        3677      157166
     1975   8        3640      177642
     1975   9        3632      154707
     1975  10        3635      152470
     1975  11        3639      151617
     1975  12        3578      138798
     1976   1        3648      133442
     1976   2        3669      148362
     1976   3        3684      148077
     1976   4        3643      148381
     1976   5        3622      152997
     1976   6        3685      152815
     1976   7        3666      146489
     1976   8        3653      168748
     1976   9        3613      142908
     1976  10        3622      147187
     1976  11        3615      145825
     1976  12        3584      133955
     1977   1        3648      127087
     1977   2        3642      139437
     1977   3        3662      142094
     1977   4        3653      138660
     1977   5        3653      140287
     1977   6        3642      139387
     1977   7        3628      142168
     1977   8        3643      159231
     1977   9        3615      138122
     1977  10        3597      139449
     1977  11        3580      135304
     1977  12        3513      127037
     1978   1        3646      125678
     1978   2        3659      140287
     1978   3        3651      140829
     1978   4        3595      142576
     1978   5        3645      142261
     1978   6        3627      129148
     1978   7        3611      145642
     1978   8        3621      172571
     1978   9        3568      145835
     1978  10        3555      143144
     1978  11        3538      146004
     1978  12        3535      152781
     1979   1        3587      157545
     1979   2        3555      174917
     1979   3        3596      175119
     1979   4        3564      178898
     1979   5        3557      191470
     1979   6        3571      193948
     1979   7        3539      195457
     1979   8        3593      225056
     1979   9        3566      192078
     1979  10        3576      193661
     1979  11        3564      187710
     1979  12        3546      160651
     1980   1        3565      168993
     1980   2        3549      189251
     1980   3        3561      187644
     1980   4        3563      193523
     1980   5        3557      199054
     1980   6        3569      193609
     1980   7        3559      190491
     1980   8        3523      222613
     1980   9        3525      188588
     1980  10        3535      187363
     1980  11        3497      191557
     1980  12        3458      176228
     1981   1        3614      174256
     1981   2        3635      182386
     1981   3        3629      183872
     1981   4        3611      187340
     1981   5        3593      186876
     1981   6        3594      185969
     1981   7        3593      186622
     1981   8        3600      214783
     1981   9        3608      188578
     1981  10        3600      185092
     1981  11        3597      188207
     1981  12        3577      164419
     1982   1        3548      147759
     1982   2        3564      164827
     1982   3        3563      173024
     1982   4        3557      178276
     1982   5        3562      179009
     1982   6        3559      183110
     1982   7        3553      174901
     1982   8        3570      204590
     1982   9        3575      176208
     1982  10        3584      179790
     1982  11        3563      176058
     1982  12        3569      159764
     1983   1        3531      151567
     1983   2        3584      172916
     1983   3        3580      172081
     1983   4        3585      177848
     1983   5        3567      179132
     1983   6        3584      188627
     1983   7        3552      185744
     1983   8        3556      213231
     1983   9        3558      184108
     1983  10        3590      184188
     1983  11        3556      183758
     1983  12        3536      168231
     1984   1        3560      163237
     1984   2        3555      184115
     1984   3        3537      186548
     1984   4        3539      185697
     1984   5        3542      192002
     1984   6        3552      194792
     1984   7        3567      194908
     1984   8        3532      229712
     1984   9        3519      199433
     1984  10        3512      204710
     1984  11        3539      205210
     1984  12        3507      185857
     1985   1        3552      182282
     1985   2        3558      196724
     1985   3        3564      203717
     1985   4        3563      207969
     1985   5        3532      209236
     1985   6        3536      212682
     1985   7        3541      209384
     1985   8        3545      251933
     1985   9        3542      207813
     1985  10        3533      211838
     1985  11        3495      203536
     1985  12        3448      194659
     1986   1        3476      200406
     1986   2        3484      220694
     1986   3        3505      227634
     1986   4        3522      240757
     1986   5        3522      235142
     1986   6        3492      238302
     1986   7        3526      230719
     1986   8        3503      173449
     1986   9        3480      222639
     1986  10        3461      221883
     1986  11        3451      224251
     1986  12        3469      203463
     1987   1        3489      211540
     1987   2        3488      218966
     1987   3        3474      210695
     1987   4        3476      220189
     1987   5        3470      230699
     1987   6        3468      231938
     1987   7        3481      225311
     1987   8        3455      263841
     1987   9        3468      227341
     1987  10        3487      225505
     1987  11        3456      223344
     1987  12        3467      207500
     1988   1        3472      205243
     1988   2        3462      217489
     1988   3        3475      220171
     1988   4        3453      226295
     1988   5        3452      228858
     1988   6        3431      231096
     1988   7        3431      230198
     1988   8        3455      270846
     1988   9        3429      230488
     1988  10        3443      227219
     1988  11        3446      219810
     1988  12        3415      200929
     1989   1        3407      206883
     1989   2        3417      210892
     1989   3        3404      206213
     1989   4        3420      211599
     1989   5        3419      221530
     1989   6        3382      211783
     1989   7        3409      212930
     1989   8        3372      249617
     1989   9        3404      215352
     1989  10        3404      212301
     1989  11        3389      210508
     1989  12        3376      190628
     1990   1        3302      187149
     1990   2        3282      207064
     1990   3        3305      208858
     1990   4        3301      208655
     1990   5        3263      217298
     1990   6        3254      223236
     1990   7        3224      218158
     1990   8        3215      259527
     1990   9        3207      222660
     1990  10        3272      223994
     1990  11        3249      218805
     1990  12        3225      203398
     1991   1        3031      191900
     1991   2        3005      205933
     1991   3        3018      202262
     1991   4        3009      206264
     1991   5        2992      209405
     1991   6        2988      201436
     1991   7        2956      194419
     1991   8        2946      236588
     1991   9        3021      207477
     1991  10        2972      202541
     1991  11        2913      193774
     1991  12        2919      190653
     1992   1        2966      190414
     1992   2        2924      207872
     1992   3        2909      213678
     1992   4        2951      218518
     1992   5        2978      222752
     1992   6        2955      225022
     1992   7        2908      222185
     1992   8        2937      251610
     1992   9        2931      231433
     1992  10        2925      236427
     1992  11        2907      232292
     1992  12        2892      220021
     1993   1        2891      212395
     1993   2        2882      219427
     1993   3        2873      228425
     1993   4        2873      240542
     1993   5        2844      246552
     1993   6        2862      252464
     1993   7        2863      246119
     1993   8        2887      290595
     1993   9        2879      247000
     1993  10        2894      256565
     1993  11        2839      256480
     1993  12        2865      246501
     1994   1        2868      235225
     1994   2        2887      237641
     1994   3        2885      239660
     1994   4        2856      242788
     1994   5        2841      249338
     1994   6        2850      251151
     1994   7        2865      248779
     1994   8        2817      306413
     1994   9        2845      253888
     1994  10        2841      241097
     1994  11        2830      246794
     1994  12        2818      230848
     1995   1        2855      228254
     1995   2        2851      255159
     1995   3        2886      255555
     1995   4        2856      268762
     1995   5        2836      286636
     1995   6        2848      288197
     1995   7        2805      292975
     1995   8        2824      353404
     1995   9        2823      307411
     1995  10        2822      304703
     1995  11        2815      303046
     1995  12        2795      294207
     1996   1        2811      279445
     1996   2        2802      300400
     1996   3        2782      288988
     1996   4        2786      296535
     1996   5        2762      303215
     1996   6        2779      309025
     1996   7        2738      300412
     1996   8        2754      358741
     1996   9        2751      303620
     1996  10        2728      296934
     1996  11        2708      286100
     1996  12        1831      267791
     1997   1        1796      262437
     1997   2        1829      260134
     1997   3        1821      259821
     1997   4        1829      261570
     1997   5        1805      269436
     1997   6        1767      263288
     1997   7        1783      279058
     1997   8        1791      328243
     1997   9        1790      280173
     1997  10        1808      278867
     1997  11        1796      263306
     1997  12        1763      248122
     1998   1        1791      244447
     1998   2        1808      257042
     1998   3        1789      261764
     1998   4        1784      259000
     1998   5        1754      259785
     1998   6        1796      270941
     1998   7        1796      282540
     1998   8        1802      321656
     1998   9        1800      274377
     1998  10        1786      273521
     1998  11        1777      273788
     1998  12        1754      259231
     1999   1        1763      243193
     1999   2        1779      265998
     1999   3        1770      275337
     1999   4        1752      280947
     1999   5        1764      305908
     1999   6        1767      319398
     1999   7        1761      329098
     1999   8        1753      390664
     1999   9        1745      322103
     1999  10        1743      333307
     1999  11        1719      335112
     1999  12        1721      338367
     2000   1        1685      333926
     2000   2        1666      326633
     2000   3        1667      336638
     2000   4        1674      352589
     2000   5        1638      361560
     2000   6        1691      360409
     2000   7        1660      358267
     2000   8        1691      432211
     2000   9        1663      363254
     2000  10        1672      367694
     2000  11        1621      345585
     2000  12        1609      332040
     2001   1        1412      324347
     2001   2        1421      337992
     2001   3        1408      338271
     2001   4        1419      352081
     2001   5        1342      353540
     2001   6        1392      344984
     2001   7        1394      358135
     2001   8        1424      443623
     2001   9        1416      392191
     2001  10        1397      395581
     2001  11        1380      387252
     2001  12        1378      371474
     2002   1        1373      378807
     2002   2        1387      378673
     2002   3        1412      380143
     2002   4        1389      423277
     2002   5        1393      436461
     2002   6        1406      446232
     2002   7        1405      427782
     2002   8        1401      529925
     2002   9        1436      408815
     2002  10        1421      407576
     2002  11        1438      402362
     2002  12        1426      404481
     2003   1        1431      389873
     2003   2        1416      401964
     2003   3        1377      412023
     2003   4        1399      416784
     2003   5        1410      465767
     2003   6        1411      502345
     2003   7        1380      496224
     2003   8        1368      582494
     2003   9        1411      505112
     2003  10        1442      489224
     2003  11        1410      458436
     2003  12        1432      462667
     2004   1        1455      453682
     2004   2        1424      460367
     2004   3        1417      474026
     2004   4        1379      483542
     2004   5        1375      492803
     2004   6        1357      491132
     2004   7        1382      509813
     2004   8        1358      593722
     2004   9        1381      519319
     2004  10        1358      524451
     2004  11        1340      520969
     2004  12        1381      506139
     2005   1        1397      522540
     2005   2        1371      725158
     2005   3        1368      712198
     2005   4        1385      708032
     2005   5        1373      758473
     2005   6        1385      812630
     2005   7        1378      933012
     2005   8        1390     1147076
     2005   9        1390      975411
     2005  10        1430     1045093
     2005  11        1473     1044897
     2005  12        1441     1055235
     2006   1        1391     1085075
     2006   2        1449     1095210
     2006   3        1450     1067788
     2006   4        1438     1081845
     2006   5        1428     1059323
     2006   6        1273     1019208
     2006   7        1269     1060929
     2006   8        1230     1252968
     2006   9        1192     1049753
     2006  10        1258     1037722
     2006  11        1288     1081240
     2006  12        1220     1071041
     2007   1        1191     1047173
     2007   2        1167     1050216
     2007   3        1147     1037870
     2007   4        1163     1051157
     2007   5        1165     1025338
     2007   6        1188      920330
     2007   7        1180      940067
     2007   8        1138     1132323
     2007   9        1192     1018359
     2007  10        1146      995136
     2007  11        1081     1034062

   Prof. Phil Jones
   Climatic Research Unit        Telephone +44 (0) 1603 592090
   School of Environmental Sciences    Fax +44 (0) 1603 507784
   University of East Anglia
   Norwich                          Email    p.jones@uea.ac.uk
   NR4 7TJ
   UK
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