| YEAR | JUN | JUL | AUG | SEP | JJAS | | | |
|---|
| NORMAL (1971-2020) | 165.3 | 280.4 | 254.9 | 167.9 | 868.5 | | | |
| 1901 | -32.1 | -13.9 | 5.5 | -24.9 | -13.8 | | | |
| 1902 | -34.1 | 1 | -20.7 | 19.7 | -8.4 | | | |
| 1903 | -29.2 | 4.1 | 6.7 | 19.2 | 1.5 | | | |
| 1904 | -0.5 | -6.8 | -19.9 | -22.2 | -12.4 | | | |
| 1905 | -44.2 | -10.2 | -21 | 5.7 | -16.8 | | | |
| 1906 | 7.6 | 1.8 | -2.4 | 9 | 3.1 | | | |
| 1907 | -7.6 | -20.1 | 21.2 | -42.6 | -10 | | | |
| 1908 | -23.5 | 16.3 | 23 | -8.9 | 5.8 | | | |
| 1909 | 25.1 | 9.9 | -8 | -3.4 | 5 | | | |
| 1910 | 28.4 | -11.9 | 13.6 | 10.5 | 7.6 | | | |
| 1911 | 15.1 | -41.8 | -15.8 | 7.3 | -13.8 | | | |
| 1912 | -35.4 | 17.8 | 2.9 | -28.9 | -5.7 | | | |
| 1913 | 29.4 | -4.4 | -24 | -34.9 | -9.6 | | | |
| 1914 | -5.3 | 25.4 | -4.9 | 16.3 | 8.9 | | | |
| 1915 | -5.7 | -17.7 | -10.3 | 3.8 | -9.1 | | | |
| 1916 | 40.6 | -3.3 | 23.2 | 19.4 | 17.2 | | | |
| 1917 | 41 | 2.3 | 16.8 | 68.1 | 26.6 | | | |
| 1918 | 28.4 | -33.6 | -4.2 | -32.9 | -13 | | | |
| 1919 | 18.1 | 10.4 | 13.8 | -3 | 10.3 | | | |
| 1920 | -1 | 6 | -24.4 | -26.6 | -10.6 | | | |
| 1921 | 16.3 | 5 | 9.7 | 22.2 | 11.8 | | | |
| 1922 | 24.1 | 13.7 | -13.4 | 21.6 | 9.3 | | | |
| 1923 | -38.5 | 21.6 | 8.7 | 4.3 | 3.1 | | | |
| 1924 | -18.7 | 17.9 | 1.9 | 41.6 | 10.8 | | | |
| 1925 | 23.6 | 9.2 | -6.2 | -16.6 | 2.4 | | | |
| 1926 | -41.1 | 14.3 | 32.4 | 26.1 | 11.4 | | | |
| 1927 | 7 | 24.8 | 2 | 2.6 | 10.4 | | | |
| 1928 | 8.2 | 9.1 | -8.5 | -13.1 | -0.5 | | | |
| 1929 | 17.7 | 6.2 | -3.8 | -25.3 | -0.6 | | | |
| 1930 | 8.8 | 4.2 | -16.5 | 4.5 | -0.9 | | | |
| 1931 | -19.9 | 14.4 | 21.1 | 13.8 | 9.7 | | | |
| 1932 | -14.4 | 19.2 | -6.1 | 8.6 | 3.3 | | | |
| 1933 | 30.6 | 1.6 | 24.1 | 26.9 | 18.6 | | | |
| 1934 | 30.2 | 1.7 | 16.4 | -0.8 | 11 | | | |
| 1935 | -3.9 | 13.2 | -2.3 | 11.4 | 5 | | | |
| 1936 | 49.4 | 4.7 | -5.9 | 16.3 | 12.3 | | | |
| 1937 | -1.4 | 20.5 | -17.7 | 4.6 | 2 | | | |
| 1938 | 65.4 | 7.9 | -1.1 | 1.5 | 15 | | | |
| 1939 | 3.8 | -2.3 | -8.9 | -7.3 | -4 | | | |
| 1940 | 5.6 | 10.8 | 10.4 | -25.5 | 2.6 | | | |
| 1941 | 3.3 | -14.2 | -9.1 | -7.3 | -8.1 | | | |
| 1942 | 15.1 | 22.6 | 15 | 8.4 | 16.2 | | | |
| 1943 | 1 | 11.1 | -8.4 | 25.8 | 6.3 | | | |
| 1944 | -6.5 | 26.4 | 14 | -7.2 | 10 | | | |
| 1945 | -5.1 | 18.9 | -3.1 | 27.5 | 9.5 | | | |
| 1946 | 28.7 | 13.6 | 16.6 | -14.1 | 12 | | | |
| 1947 | -21.2 | 11.7 | 14.1 | 43.1 | 12.2 | | | |
| 1948 | -2.2 | 23.1 | 10.9 | 5.6 | 11.3 | | | |
| 1949 | -1.9 | 13.1 | -5.1 | 34.5 | 9 | | | |
| 1950 | -19.1 | 18.9 | -8.1 | 20.9 | 4.2 | | | |
| 1951 | -3.1 | -11 | -13.2 | -26.6 | -13.2 | | | |
| 1952 | -1 | 1.5 | 0.5 | -29.5 | -5.3 | | | |
| 1953 | -1.8 | 14.5 | 17.6 | 6.2 | 10.7 | | | |
| 1954 | -14.6 | 4.8 | -9.5 | 47 | 5.1 | | | |
| 1955 | 5.7 | -16.7 | 26.2 | 29.8 | 9.1 | | | |
| 1956 | 26.6 | 29.5 | 2.3 | -1.4 | 15 | | | |
| 1957 | -6.6 | 9 | 7.1 | -21.6 | -0.5 | | | |
| 1958 | -26.1 | 12.6 | 26.2 | 37.6 | 14 | | | |
| 1959 | 1.5 | 33.5 | 3.9 | 40.9 | 20.1 | | | |
| 1960 | -4.8 | 13.1 | -0.9 | 8 | 4.6 | | | |
| 1961 | 16.4 | 20.2 | 12.4 | 40.1 | 21 | | | |
| 1962 | -18.2 | 0.1 | 8.4 | 25.2 | 3.9 | | | |
| 1963 | 1 | -8.4 | 24.6 | -1.5 | 4.4 | | | |
| 1964 | 6.2 | 22.5 | 7.2 | 18.8 | 14.2 | | | |
| 1965 | -30.1 | -4 | -24.6 | -22.5 | -18.6 | | | |
| 1966 | 7 | -10.3 | -15.1 | -12.3 | -8.8 | | | |
| 1967 | -13.6 | 8.6 | 3.6 | 2 | 1.6 | | | |
| 1968 | -10.5 | 10 | -16 | -23.3 | -8 | | | |
| 1969 | -21.2 | 14.3 | 8.7 | 3.5 | 3.8 | | | |
| 1970 | 30.6 | -10.4 | 25 | 27.8 | 15.2 | | | |
| 1971 | 38.4 | -4.4 | 5.3 | -11.9 | 5.1 | | | |
| 1972 | -26.2 | -27.2 | -13.8 | -23.2 | -22.3 | | | |
| 1973 | -9.6 | -0.7 | 22.6 | 9.4 | 6.4 | | | |
| 1974 | -25.7 | 0 | -9.3 | -14.5 | -10.4 | | | |
| 1975 | 5.7 | 9.8 | 13.2 | 35 | 14.9 | | | |
| 1976 | -4.8 | 4 | 15.1 | -14.9 | 1.9 | | | |
| 1977 | 11.8 | 14.8 | -3.9 | -12.8 | 3.4 | | | |
| 1978 | 25.3 | 3.2 | 10.6 | -3.8 | 8.2 | | | |
| 1979 | -15.8 | -15.1 | -17.5 | -19 | -16.7 | | | |
| 1980 | 38.5 | 5.7 | 3.7 | -13.7 | 7.6 | | | |
| 1981 | -8.3 | 10.3 | -6.4 | 10.7 | 1.9 | | | |
| 1982 | -17.4 | -17.8 | 8.3 | -24.9 | -11.4 | | | |
| 1983 | -9.3 | 0.7 | 20 | 50 | 14 | | | |
| 1984 | 15.4 | 2 | 4 | -13.5 | 2.1 | | | |
| 1985 | -6.3 | 3.4 | -8.2 | -9.9 | -4.4 | | | |
| 1986 | 9.4 | -6.7 | -10.4 | -25.8 | -8.5 | | | |
| 1987 | -21.1 | -21.5 | -4.6 | -10.3 | -14.3 | | | |
| 1988 | -4.6 | 34.3 | 17.7 | 30.1 | 21.2 | | | |
| 1989 | 11.3 | 7.8 | -7 | -2.4 | 2.1 | | | |
| 1990 | 15.2 | 2.3 | 13.8 | 16.8 | 10.9 | | | |
| 1991 | 11.1 | -1.2 | 2 | -19.1 | -1.4 | | | |
| 1992 | -17.4 | -5 | 11.8 | 0 | -1.4 | | | |
| 1993 | 2.6 | 8.6 | -20.8 | 24.8 | 2 | | | |
| 1994 | 22.9 | 25.1 | 12.2 | -11.3 | 13.9 | | | |
| 1995 | -16.5 | 14.2 | 4.8 | 7.3 | 4.3 | | | |
| 1996 | 11.6 | -5.4 | 17.7 | -12 | 3.3 | | | |
| 1997 | 3.8 | 1.5 | 3.2 | -10.2 | 0.2 | | | |
| 1998 | -2.2 | 0.7 | -2.4 | 20.8 | 3.1 | | | |
| 1999 | 3.3 | -5.1 | -12.9 | 11.3 | -2.6 | | | |
| 2000 | 12 | -4.2 | -11.6 | -19.1 | -6.2 | | | |
| 2001 | 30.2 | -0.1 | -19.3 | -34.8 | -6.7 | | | |
| 2002 | 2.3 | -50.6 | -4.4 | -19 | -20.9 | | | |
| 2003 | -0.4 | 8.3 | -2.6 | 7.4 | 3.3 | | | |
| 2004 | 0.6 | -13.4 | -0.8 | -26.6 | -9.6 | | | |
| 2005 | -11.8 | 18.9 | -25 | 20 | 0.4 | | | |
| 2006 | -8.7 | 2.7 | 13.1 | 1.7 | 3.4 | | | |
| 2007 | 20.9 | 5 | 1.6 | 27 | 11.3 | | | |
| 2008 | 27.3 | -9.3 | 4.2 | -0.7 | 3.3 | | | |
| 2009 | -47.1 | 1.9 | -24.1 | -15.2 | -18.3 | | | |
| 2010 | -14.5 | 6.7 | 7.2 | 17.9 | 5 | | | |
| 2011 | 10.8 | -11.6 | 13.3 | 14.1 | 4.9 | | | |
| 2012 | -26.9 | -9 | 3.7 | 17.2 | -3.6 | | | |
| 2013 | 33.5 | 10.7 | 1.5 | -8.4 | 8.6 | | | |
| 2014 | -44.3 | -5.3 | -8.3 | 12.9 | -10.1 | | | |
| 2015 | 14 | -14.4 | -21.6 | -22.6 | -12.7 | | | |
| 2016 | -10.7 | 10 | -6 | 1.1 | -0.3 | | | |
| 2017 | 4.5 | 3.5 | -10 | -8.8 | -2.6 | | | |
| 2018 | -5.4 | -2.2 | -5.5 | -21.1 | -7.4 | | | |
| 2019 | -31.3 | 5.9 | 17.7 | 55 | 11.8 | | | |
| 2020 | 18.5 | -8.3 | 28.8 | 6.1 | 10.5 | | | |
| 2021 | 10.3 | -5 | -23.8 | 36.6 | 0.4 | | | |
| 2022 | -7.92363265391642 | 16.6566937705201 | 3.57641849387909 | 8.01767541706054 | 6.47043852354682 | | | |
| 2023 | -7.48655274780171 | 12.8423390776343 | -36.0947592044326 | 13.1239092972872 | -5.322165582188375 | | | |
| 2024 | -10.90948171713 | 8.60266876262123 | 15.1489300508867 | 11.7635253393033 | 7.7490461818506 | | | |
| 2025 | 9 | 4.8 | 5.1 | 15.3 | 7.8 | | | |
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