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| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1938 | 42.6 | 47.2 | 30.9 | 76.3 | 56.8 | 56.6 | 31.7 | 83.8 | 440.6 | 134.9 | 85.8 | 85.4 | 1172.6 |
| 1939 | 38.0 | 26.7 | 20.6 | 88.3 | 53.9 | 94.2 | 182.6 | 69.6 | 103.8 | 78.0 | 125.3 | 141.3 | 1022.3 |
| 1940 | 98.5 | 48.5 | 167.6 | 106.4 | 73.5 | 93.3 | 72.0 | 227.8 | 65.2 | 85.5 | 125.5 | 179.6 | 1343.4 |
| 1941 | 83.1 | 83.8 | 96.1 | 48.5 | 84.2 | 68.3 | 112.3 | 29.0 | 172.4 | 248.6 | 79.1 | 134.2 | 1239.6 |
| 1942 | 59.0 | 70.6 | 104.5 | 104.9 | 111.2 | 45.6 | 143.8 | 160.3 | 126.5 | 89.0 | 235.6 | 122.7 | 1373.7 |
| 1943 | 118.1 | 73.0 | 27.1 | 49.8 | 46.6 | 57.8 | 93.6 | 173.4 | 63.5 | 153.7 | 185.9 | 113.7 | 1156.2 |
| 1944 | 47.5 | 68.1 | 40.6 | 22.0 | 23.0 | 109.6 | 52.9 | 115.3 | 242.2 | 91.6 | 122.8 | 115.4 | 1051.0 |
| 1945 | 42.4 | 28.5 | 34.9 | 56.1 | 121.0 | 39.6 | 47.2 | 86.1 | 60.3 | 129.2 | 117.6 | 173.1 | 936.0 |
| 1946 | 86.3 | 80.2 | 61.2 | 81.1 | 77.2 | 110.4 | 50.6 | 48.9 | 226.0 | 198.2 | 80.0 | 97.3 | 1197.4 |
| 1947 | 115.5 | 48.7 | 47.3 | 161.9 | 39.2 | 32.5 | 227.7 | 82.0 | 190.5 | 166.0 | 160.7 | 135.8 | 1407.8 |
| 1948 | 82.6 | 68.3 | 31.0 | 58.6 | 114.9 | 80.3 | 137.8 | 31.7 | 134.3 | 57.8 | 94.9 | 75.6 | 967.8 |
| 1949 | 86.6 | 46.1 | 77.6 | 34.8 | 58.9 | 7.3 | 38.7 | 83.6 | 155.0 | 142.6 | 131.0 | 74.8 | 937.0 |
| 1950 | 74.2 | 17.6 | 53.0 | 30.9 | 117.0 | 13.4 | 103.8 | 179.0 | 184.2 | 105.3 | 99.8 | 86.5 | 1064.7 |
| 1951 | 73.0 | 77.1 | 96.3 | 48.7 | 61.0 | 70.3 | 68.0 | 90.0 | 231.4 | 131.0 | 137.8 | 51.3 | 1135.9 |
| 1952 | 140.5 | 72.4 | 55.7 | 39.4 | 18.4 | 57.1 | 160.2 | 87.9 | 171.7 | 132.2 | 91.9 | 94.0 | 1121.4 |
| 1953 | 85.2 | 59.3 | 58.4 | 55.6 | 65.6 | 88.3 | 105.0 | 20.0 | 172.7 | 80.8 | 107.6 | 110.5 | 1009.0 |
| 1954 | 109.9 | 77.4 | 56.6 | 59.1 | 152.2 | 27.4 | 130.5 | 196.2 | 136.8 | 130.8 | 123.6 | 133.6 | 1334.1 |
| 1955 | 106.8 | 76.8 | 114.3 | 37.1 | 64.9 | 100.7 | 199.0 | 274.4 | 108.1 | 169.0 | 127.0 | 132.1 | 1510.2 |
| 1956 | 85.3 | 89.2 | 37.8 | 67.2 | 46.1 | 74.8 | 83.7 | 69.7 | 47.0 | 70.6 | 152.1 | 165.4 | 988.9 |
| 1957 | 126.2 | 64.8 | 90.3 | 52.9 | 42.1 | 145.4 | 68.1 | 129.3 | 197.5 | 115.2 | 107.7 | 145.7 | 1285.2 |
| 1958 | 138.4 | 42.0 | 111.2 | 78.8 | 56.9 | 70.7 | 201.9 | 158.6 | 81.8 | 103.0 | 43.5 | 75.9 | 1162.7 |
| 1959 | 143.6 | 41.4 | 31.8 | 90.1 | 61.4 | 99.2 | 136.0 | 25.6 | 174.3 | 176.0 | 99.4 | 131.7 | 1210.5 |
| 1960 | 71.6 | 59.2 | 49.8 | 74.1 | 184.6 | 105.6 | 75.0 | 66.5 | 158.7 | 92.5 | 92.0 | 73.8 | 1103.4 |
| 1961 | 97.5 | 76.4 | 47.6 | 111.3 | 196.1 | 42.4 | 158.7 | 68.5 | 161.7 | 110.3 | 109.6 | 117.3 | 1297.4 |
| 1962 | 103.5 | 90.2 | 139.9 | 93.6 | 70.0 | 110.5 | 213.6 | 185.1 | 191.3 | 176.4 | 229.3 | 150.3 | 1753.7 |
| 1963 | 162.8 | 19.9 | 44.7 | 88.5 | 56.7 | 111.4 | 157.2 | 57.8 | 177.5 | 116.1 | 145.2 | 123.6 | 1261.4 |
| 1964 | 106.0 | 35.6 | 38.4 | 46.5 | 57.4 | 59.0 | 153.1 | 218.4 | 163.0 | 134.7 | 119.5 | 160.7 | 1292.3 |
| 1965 | 125.6 | 118.0 | 98.3 | 62.7 | 66.5 | 66.4 | 79.1 | 152.9 | 330.2 | 163.7 | 137.9 | 170.5 | 1571.8 |
| 1966 | 170.6 | 148.0 | 102.7 | 84.1 | 92.2 | 56.1 | 162.7 | 164.8 | 82.0 | 130.7 | 243.1 | 182.7 | 1619.7 |
| 1967 | 102.6 | 69.5 | 45.1 | 92.5 | 59.3 | 108.0 | 135.0 | 21.1 | 111.3 | 99.9 | 134.0 | 192.2 | 1170.5 |
| 1968 | 111.0 | 57.5 | 49.5 | 14.0 | 50.5 | 25.5 | 73.5 | 97.0 | 104.0 | 48.5 | 108.5 | 76.0 | 815.5 |
| 1969 | 144.5 | 88.0 | 34.5 | 23.5 | 75.0 | 98.5 | 90.5 | 134.0 | 69.0 | 91.0 | 84.0 | 129.5 | 1062.0 |
| 1970 | 114.0 | 81.0 | 79.0 | 47.0 | 119.5 | 48.5 | 106.0 | 133.5 | 105.0 | 247.5 | 145.5 | 83.0 | 1309.5 |
| 1971 | 65.0 | 51.5 | 32.5 | 15.5 | 53.0 | 101.0 | 106.0 | 163.0 | 86.5 | 224.0 | 68.0 | 95.5 | 1061.5 |
| 1972 | 54.0 | 110.5 | 21.5 | 28.5 | 95.0 | 74.5 | 107.0 | 104.0 | 245.5 | 134.5 | 180.5 | 163.5 | 1319.0 |
| 1973 | 46.5 | 108.0 | 68.0 | 77.0 | 119.0 | 3.0 | 78.0 | 108.0 | 76.5 | 87.0 | 150.5 | 180.0 | 1101.5 |
| 1974 | 67.0 | 50.0 | 63.5 | 93.5 | 50.5 | 144.0 | 24.0 | 118.5 | 123.0 | 185.0 | 177.0 | 118.0 | 1214.0 |
| 1975 | 149.5 | 42.0 | 52.5 | 31.5 | 39.0 | 67.5 | 79.0 | 98.0 | 112.0 | 111.5 | 123.5 | 80.5 | 986.5 |
| 1976 | 84.5 | 42.5 | 33.0 | 35.5 | 23.5 | 37.0 | 108.5 | 140.0 | 74.5 | 137.0 | 182.0 | 114.5 | 1012.5 |
| 1977 | 80.0 | 57.0 | 56.0 | 66.0 | 92.5 | 67.0 | 69.5 | 43.0 | 145.5 | 79.0 | 116.0 | 148.0 | 1019.5 |
| 1978 | 127.5 | 38.0 | 64.0 | 79.0 | 115.0 | 49.0 | 99.5 | 167.5 | 43.0 | 73.0 | 40.5 | 82.0 | 978.0 |
| 1979 | 87.5 | 92.0 | 68.5 | 28.5 | 27.0 | 113.0 | 67.5 | 8.5 | 95.5 | 130.0 | 111.0 | 52.0 | 881.0 |
| 1980 | 146.0 | 93.5 | 62.0 | 51.0 | 67.5 | 58.5 | 72.5 | 24.5 | 90.0 | 105.5 | 57.0 | 165.5 | 993.5 |
| 1981 | 62.5 | 41.0 | 94.5 | 43.5 | 90.5 | 21.0 | 153.0 | 217.5 | 125.5 | 161.0 | 122.0 | 105.0 | 1237.0 |
| 1982 | 96.5 | 55.0 | 47.0 | 73.0 | 59.0 | 33.5 | 29.0 | 58.0 | 103.5 | 142.0 | 131.5 | 115.5 | 943.5 |
| 1983 | 84.5 | 98.5 | 43.0 | 39.5 | 71.5 | 60.5 | 73.5 | 56.5 | 106.0 | 197.5 | 84.0 | 105.0 | 1020.0 |
| 1984 | 83.5 | 39.0 | 37.0 | 11.5 | 30.5 | 91.0 | 37.0 | 113.0 | 132.0 | 126.5 | 90.0 | 96.5 | 887.5 |
| 1985 | 96.0 | 70.5 | 18.0 | 26.0 | 81.5 | 44.0 | 80.5 | 153.5 | 109.5 | 175.0 | 118.5 | 143.5 | 1116.5 |
| 1986 | 93.0 | 60.5 | 39.0 | 73.0 | 69.5 | 22.5 | 50.5 | 37.5 | 79.0 | 54.0 | 137.0 | 61.0 | 776.5 |
| 1987 | 95.0 | 62.5 | 49.5 | 36.5 | 56.0 | 28.5 | 59.0 | 132.5 | 98.0 | 114.0 | 123.5 | 82.5 | 937.5 |
| 1988 | 69.0 | 81.5 | 36.0 | 60.5 | 31.0 | 70.5 | 21.5 | 87.5 | 64.0 | 113.5 | 123.5 | 117.5 | 876.0 |
| 1989 | 40.0 | 21.0 | 20.5 | 50.0 | 62.5 | 60.5 | 43.0 | 131.5 | 266.5 | 185.5 | 112.0 | 117.5 | 1110.5 |
| 1990 | 78.0 | 44.5 | 43.5 | 70.0 | 52.0 | 73.5 | 103.0 | 167.0 | 106.5 | 56.5 | 139.0 | 154.0 | 1087.5 |
| 1991 | 137.5 | 47.5 | 90.5 | 31.0 | 40.5 | 85.5 | 92.0 | 65.5 | 105.5 | 105.5 | 97.0 | 100.5 | 998.5 |
| 1992 | 68.5 | 64.5 | 9.5 | 57.0 | 56.0 | 31.0 | 122.0 | 33.0 | 262.0 | 92.5 | 154.0 | 160.5 | 1110.5 |
| 1993 | 79.5 | 45.0 | 28.5 | 70.5 | 21.5 | 55.5 | 6.0 | 76.5 | 52.0 | 119.5 | 123.5 | 125.5 | 803.5 |
| 1994 | 120.5 | 65.5 | 58.5 | 37.0 | 90.0 | 63.5 | 111.0 | 105.5 | 170.0 | 64.5 | 84.0 | 137.0 | 1107.0 |
| 1995 | 71.0 | 32.5 | 56.0 | 36.5 | 55.0 | 29.5 | 195.0 | 149.0 | 119.5 | 95.0 | 170.5 | 86.5 | 1096.0 |
| 1996 | 112.5 | 43.0 | 61.5 | 26.0 | 112.5 | 32.5 | 107.0 | 175.5 | 140.0 | 282.5 | 109.0 | 150.5 | 1352.5 |
| 1997 | 116.5 | 44.0 | 51.5 | 33.5 | 62.0 | 88.5 | 78.5 | 163.0 | 130.0 | 242.0 | 134.0 | 68.5 | 1212.0 |
| 1998 | 140.5 | 49.5 | 39.0 | 37.5 | 52.5 | 21.5 | 102.5 | 38.0 | 117.0 | 101.0 | 208.5 | 151.0 | 1058.5 |
| 1999 | 89.5 | 67.5 | 77.0 | 43.5 | 90.5 | 59.5 | 200.5 | 237.0 | 138.5 | 185.0 | 124.5 | 96.5 | 1409.5 |
| 2000 | 47.0 | 35.0 | 58.5 | 109.5 | 71.0 | 54.0 | 100.5 | 70.0 | 62.5 | 205.0 | 129.5 | 101.5 | 1044.0 |
| 2001 | 72.0 | 63.5 | 44.0 | 49.0 | 64.0 | 76.5 | 84.0 | 159.0 | 110.5 | 85.5 | 129.5 | 101.0 | 1038.5 |
| 2002 | 77.0 | 53.0 | 44.0 | 84.5 | 23.0 | 57.0 | 202.5 | 107.5 | 29.5 | 243.5 | 156.5 ) | 116.5 | 1194.5 |
| 2003 | 94.0 | 31.0 | 36.5 | 44.0 | 18.5 | 45.0 | 40.5 | 170.5 | 130.5 | 139.0 | 113.5 | 84.5 | 947.5 |
| 2004 | 90.5 | 113.5 | 45.0 | 49.5 | 137.0 | 57.5 | 88.5 | 42.0 | 209.5 | 79.0 | 70.0 | 171.0 | 1153.0 |
| 2005 | 86.5 | 54.5 | 52.5 | 48.5 | 94.5 | 26.0 | 58.0 | 103.0 | 167.0 | 156.5 | 117.5 | 86.5 ) | 1051.0 |
| 2006 | 69.5 | 71.0 | 97.0 | 55.5 | 128.5 | 39.5 | 39.5 | 153.5 | 114.5 | 132.0 | 122.5 ) | 103.0 | 1126.0 |
| 2007 | 35.0 | 70.5 | 36.0 | 22.5 | 85.5 | 16.0 | 30.0 | 214.5 | 159.5 | 74.0 | 77.5 | 84.5 | 905.5 |
| 2008 | 77.5 | 40.0 | 26.5 | 22.0 | 89.0 | 52.5 | 53.5 | 62.5 | 80.0 | 101.5 | 79.0 | 111.5 | 795.5 |
| 2009 | 71.0 | 147.0 | 68.5 | 34.0 | 57.0 | 161.5 | 121.5 | 99.5 | 44.5 | 96.5 | 135.5 | 134.5 | 1171.0 |
| 2010 | 75.5 | 109.5 | 100.5 | 94.0 | 76.5 | 31.5 | 233.5 | 99.5 | 170.5 | 97.0 | 108.5 | 116.0 | 1312.5 |
| 2011 | 64.5 | 39.5 | 58.0 | 92.0 | 68.5 | 67.0 | 51.0 | 56.5 | 312.0 | 116.0 | 92.5 | 186.5 | 1204.0 |
| 2012 | 79.5 | 76.5 | 52.0 | 43.0 | 64.5 | 23.5 | 107.0 | 129.5 | 169.0 | 110.5 | 157.0 | 147.5 | 1159.5 |
| 2013 | 124.0 | 49.0 | 69.5 | 78.0 | 52.0 | 29.0 | 23.5 | 116.0 | 110.0 | 106.5 | 194.5 | 93.5 | 1045.5 |
| 2014 | 105.0 | 44.0 | 20.0 | 34.5 | 62.0 | 144.5 | 44.0 | 275.5 | 256.5 | 58.5 | 103.5 | 143.0 | 1291.0 |
| 2015 | 55.5 | 48.5 | 105.5 | 40.0 | 82.0 | 132.0 | 205.5 | 20.5 | 103.5 | 182.5 | 62.5 | 110.0 | 1148.0 |
| 2016 | 118.5 | 115.5 | 40.0 | 82.5 | 41.5 | 146.0 | 154.0 | 112.0 | 316.0 | 132.5 | 129.5 | 34.5 | 1422.5 |
| 2017 | 47.5 | 37.5 | 43.0 | 68.5 | 33.0 | 86.5 | 97.0 | 70.0 | 115.0 | 104.0 | 177.5 | 153.0 | 1032.5 |
| 2018 | 122.0 | 75.0 | 95.5 | 32.0 | 102.0 | 114.0 | 121.5 | 94.0 | 56.0 | 160.0 | 70.0 | 72.0 | 1114.0 |
| 2019 | 56.0 | 46.5 | 35.5 | 11.0 | 48.0 | 48.5 | 88.0 | 163.5 | 36.5 | 55.0 | 69.0 | 91.5 | 749.0 |
| 2020 | 35.0 | 39.5 | 54.0 | 42.5 | 63.0 | 98.0 | 68.5 | 332.0 | 112.5 | 168.0 | 140.0 | 68.5 | 1221.5 |
| 2021 | 101.5 | 111.5 | 40.5 | 78.0 | 73.0 | 17.5 | 6.0 | 47.0 | 51.0 | 167.5 | 157.5 | 210.5 ) | 1061.5 |
| 2022 | 90.5 | 31.5 | 45.0 | 44.5 ) | 65.0 | 69.0 | 44.0 | 92.5 | 165.5 | 143.5 | 194.0 | 86.0 | 1071.0 |
| 2023 | 108.5 | 67.5 ) | 38.0 | 99.5 | 21.5 | 90.5 | 145.5 | 318.0 | 87.5 | 143.0 | 295.5 ) | 141.5 | 1556.5 |
| 2024 | 108.5 | 52.0 | 54.0 | 19.0 | 136.0 | 106.0 | 87.0 | 201.5 ) | 87.5 | 78.5 | 131.5 ) | 1061.5 ] |
Remarks
The red lines, if any, indicate data inhomogeneity caused by changes in instrumentation, observation methods and/or site location.