Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
1891 | -50.60 | -43.20 | -26.20 | -13.70 | 5.00 | 14.40 | 14.60 | 12.50 | 1.00 | -14.60 | -38.70 | -47.70 | -15.70 |
1892 | -55.40 | -46.80 | -33.80 | -16.30 | -1.20 | 13.90 | 11.30 | 10.00 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 |
1893 | 999.90 | 999.90 | 999.90 | -8.30 | 4.20 | 999.90 | 18.00 | 9.20 | 3.70 | -14.20 | -33.50 | -44.90 | 999.90 |
1894 | -51.10 | -44.80 | -24.40 | -7.20 | 5.70 | 12.00 | 18.10 | 8.70 | 1.10 | -13.10 | -30.70 | -42.80 | -14.30 |
1895 | -49.50 | -45.40 | -33.80 | -15.50 | 1.10 | 13.20 | 17.90 | 12.00 | 3.00 | -15.50 | -36.20 | -46.70 | -17.10 |
1896 | -47.80 | -36.80 | -32.00 | -22.30 | 0.20 | 12.60 | 15.50 | 11.60 | 4.00 | -11.10 | -33.80 | -47.80 | -16.50 |
1897 | -51.60 | -44.00 | -31.20 | -11.60 | 4.60 | 999.90 | 17.70 | 999.90 | 3.30 | -17.50 | -38.40 | -40.10 | -15.10 |
1898 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 13.20 | 14.90 | 11.40 | 2.40 | -16.80 | -39.30 | -50.20 | 999.90 |
1899 | -50.80 | -44.40 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 |
1900 | -54.10 | -46.70 | -29.40 | -11.80 | 2.00 | 9.70 | 11.10 | 8.80 | 3.00 | -13.70 | -36.60 | -51.30 | -17.80 |
1901 | -51.50 | -40.30 | -24.90 | -11.50 | 1.70 | 13.20 | 13.50 | 10.00 | 2.80 | -17.80 | -37.80 | -36.00 | -15.10 |
1902 | -50.50 | -40.40 | -31.40 | -16.00 | -2.50 | 13.80 | 14.40 | 8.30 | 0.60 | -17.00 | -39.30 | -47.60 | -17.80 |
1903 | -44.40 | -39.00 | -26.40 | -17.10 | 3.40 | 14.40 | 18.40 | 10.10 | 1.60 | -15.60 | -32.50 | -52.00 | -15.10 |
1904 | -46.90 | -45.30 | -26.10 | -13.10 | -2.40 | 9.70 | 14.20 | 10.00 | 0.30 | -18.60 | -32.10 | -42.40 | -16.30 |
1905 | -50.10 | -46.30 | -30.30 | -15.40 | 0.40 | 10.90 | 10.90 | 9.50 | 1.10 | -20.00 | 999.90 | 999.90 | -14.10 |
1906 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 999.90 | 12.00 | 4.00 | -12.80 | -37.40 | -43.00 | 999.90 |
1907 | -48.10 | -41.50 | -31.40 | -10.40 | 2.40 | 12.20 | 15.60 | 9.10 | 2.70 | -9.70 | -33.10 | -51.50 | -16.00 |
1908 | -55.10 | -43.00 | -34.00 | -13.40 | 3.90 | 14.70 | 17.60 | 9.60 | 5.50 | -10.40 | -37.00 | -50.20 | -16.90 |
1909 | -52.70 | -47.70 | -32.70 | -9.60 | 2.80 | 11.40 | 16.80 | 13.80 | 2.40 | -9.60 | -38.10 | -42.90 | -16.40 |
1910 | -44.80 | -43.30 | -31.70 | -10.60 | 1.20 | 14.00 | 14.90 | 13.30 | 2.50 | -10.50 | -35.70 | -50.90 | -15.80 |
1911 | -54.00 | -36.60 | -27.70 | -10.70 | -1.00 | 11.70 | 16.40 | 12.50 | 0.30 | -13.90 | -31.10 | -42.90 | -15.20 |
1912 | -49.30 | -46.30 | -35.20 | -12.10 | 2.40 | 17.70 | 12.30 | 10.00 | 0.60 | -17.60 | -36.80 | -49.00 | -17.70 |
1913 | -49.80 | -47.90 | -28.40 | -16.00 | 1.40 | 11.50 | 14.60 | 12.40 | 2.70 | -15.40 | -39.50 | -43.20 | -16.80 |
1914 | -51.80 | -38.90 | -33.50 | -14.90 | 0.20 | 14.70 | 18.30 | 10.10 | 4.70 | -14.80 | -39.10 | -41.70 | -16.50 |
1915 | -52.90 | -47.10 | -26.80 | -12.80 | 4.50 | 10.50 | 13.00 | 6.80 | 1.20 | -18.50 | -40.30 | -50.30 | -17.70 |
1916 | -46.50 | -47.40 | -29.10 | -13.80 | 0.60 | 12.10 | 15.60 | 13.00 | 1.40 | -9.00 | -33.00 | -48.30 | -15.90 |
1917 | -45.00 | -42.40 | -29.70 | -10.50 | 5.30 | 14.90 | 18.70 | 13.70 | 2.00 | -17.10 | -37.00 | -43.80 | -14.70 |
1918 | -48.90 | -46.80 | -27.20 | -12.80 | 1.50 | 13.20 | 12.90 | 11.20 | 2.40 | -11.40 | -36.30 | -48.60 | -16.20 |
1919 | -48.90 | -50.80 | -32.60 | -9.00 | 2.50 | 13.10 | 14.40 | 13.40 | 5.40 | -11.20 | -34.20 | -40.80 | -15.90 |
1920 | -42.10 | -39.90 | -25.30 | -6.80 | 2.00 | 11.20 | 15.80 | 12.20 | 2.50 | -16.40 | -39.20 | -45.40 | -14.30 |
1921 | -47.10 | -38.20 | -32.00 | -14.80 | 1.00 | 13.20 | 13.20 | 12.00 | 4.50 | -14.90 | -27.20 | -49.40 | -15.80 |
1922 | -50.10 | -49.20 | -29.00 | -15.30 | 0.50 | 13.10 | 13.70 | 9.30 | 1.00 | -17.20 | -39.20 | -39.40 | -17.30 |
1923 | -50.40 | -42.70 | -27.00 | -13.80 | 0.10 | 11.70 | 13.20 | 10.60 | 1.00 | -14.40 | -34.70 | -44.90 | -16.30 |
1924 | -50.60 | -45.20 | -30.00 | -15.30 | 0.50 | 12.20 | 13.70 | 11.70 | 4.10 | -15.10 | -30.20 | -40.90 | -16.20 |
1925 | -43.60 | -45.70 | -26.60 | -14.90 | 1.70 | 11.10 | 14.70 | 9.60 | 0.50 | -13.60 | -36.20 | -43.40 | -15.80 |
1926 | 999.90 | 999.90 | 999.90 | -14.80 | 2.20 | 9.10 | 16.20 | 12.00 | 4.00 | -16.70 | -35.10 | -42.10 | 999.90 |
1927 | -49.20 | -45.90 | -34.40 | -12.00 | 4.30 | 12.70 | 14.40 | 10.40 | 3.80 | -9.50 | -25.50 | -41.70 | -15.70 |
1928 | -49.20 | -43.80 | -26.60 | -10.50 | -0.50 | 11.70 | 12.90 | 11.90 | 1.00 | -13.60 | -35.20 | -40.10 | -15.60 |
1929 | -48.90 | -38.90 | -32.20 | -12.10 | 3.90 | 13.00 | 14.70 | 10.40 | -0.70 | -15.00 | -42.30 | -44.90 | -16.60 |
1930 | -45.80 | -44.10 | -21.00 | -12.70 | -2.00 | 14.30 | 14.10 | 11.40 | 3.40 | -17.00 | -33.40 | -45.90 | -14.70 |
1931 | -50.30 | -47.00 | -29.40 | -18.20 | 5.50 | 13.80 | 18.70 | 10.80 | 3.30 | -9.30 | -33.00 | -39.70 | -15.40 |
1932 | -48.90 | -39.00 | -28.30 | -13.80 | -1.60 | 14.00 | 14.40 | 12.40 | 5.10 | -12.50 | -39.60 | -49.10 | -15.90 |
1933 | -40.80 | -48.20 | -33.30 | -16.60 | 1.50 | 13.70 | 15.20 | 12.60 | 2.90 | -9.80 | -30.10 | -47.00 | -16.00 |
1934 | -45.90 | -41.70 | -31.70 | -15.40 | 3.60 | 13.20 | 19.90 | 10.20 | 3.00 | -13.00 | -36.20 | -47.50 | -15.80 |
1935 | -49.60 | -40.90 | -33.90 | -12.60 | 3.90 | 12.50 | 19.20 | 12.90 | 4.80 | -16.10 | -38.10 | -40.40 | -15.80 |
1936 | -49.50 | -42.90 | -30.50 | -12.00 | 4.10 | 12.10 | 17.70 | 11.70 | 4.40 | -15.60 | -34.20 | -43.50 | -15.50 |
1937 | -44.20 | -35.90 | -35.10 | -15.40 | 5.20 | 12.90 | 16.30 | 12.40 | 2.90 | -12.00 | -34.20 | -40.50 | -15.10 |
1938 | -45.80 | -44.50 | -28.80 | -11.40 | 1.90 | 14.20 | 17.20 | 12.00 | 4.10 | -15.90 | -27.20 | -43.00 | -14.60 |
1939 | -52.30 | -41.80 | -27.40 | -13.60 | 3.30 | 12.30 | 12.50 | 13.60 | 4.30 | -12.80 | -31.40 | -43.70 | -15.30 |
1940 | -41.40 | -43.50 | -25.20 | -10.80 | 1.30 | 14.60 | 16.50 | 9.80 | -0.40 | -22.10 | -40.10 | -47.90 | -15.60 |
1941 | -48.30 | -45.00 | -35.80 | -11.30 | 2.60 | 11.30 | 19.20 | 11.40 | 3.10 | -15.30 | -39.30 | -45.30 | -17.00 |
1942 | -41.80 | -44.90 | -37.20 | -15.20 | 2.90 | 11.90 | 14.90 | 11.30 | 1.90 | -13.20 | -35.20 | -42.50 | -16.80 |
1943 | -47.00 | -45.30 | -23.80 | -8.80 | 5.50 | 10.30 | 12.70 | 11.10 | 2.90 | -10.00 | -34.30 | -47.90 | -14.70 |
1944 | -45.20 | -40.80 | -27.40 | -13.90 | 3.50 | 11.50 | 13.30 | 11.50 | 4.80 | -16.60 | -37.00 | -42.10 | -15.30 |
1945 | -50.60 | -45.60 | -29.50 | -12.20 | 4.30 | 11.60 | 15.50 | 12.20 | 1.00 | -12.10 | -34.50 | -44.30 | -15.90 |
1946 | -48.00 | -47.30 | -31.30 | -13.60 | 1.30 | 12.20 | 14.70 | 8.70 | -0.70 | -16.90 | -36.60 | -45.80 | -17.50 |
1947 | -46.60 | -35.20 | -27.40 | -11.10 | 0.90 | 13.20 | 15.80 | 11.30 | 3.10 | -7.90 | -34.40 | -47.20 | -14.30 |
1948 | -47.60 | -41.70 | -24.40 | -9.60 | 4.20 | 14.70 | 14.30 | 12.40 | 2.00 | -9.20 | -33.70 | -46.10 | -13.90 |
1949 | -47.50 | -40.80 | -29.00 | -10.00 | 3.70 | 13.40 | 14.30 | 10.40 | 4.40 | -8.60 | -38.30 | -42.20 | -14.80 |
1950 | -47.10 | -46.40 | -30.70 | -14.90 | -1.30 | 10.50 | 999.90 | 7.90 | 0.40 | -15.90 | -40.70 | -46.80 | -18.40 |
1951 | -49.90 | -43.20 | -33.00 | -16.20 | 1.30 | 11.80 | 14.30 | 13.60 | 3.50 | -12.30 | -33.80 | -40.10 | -16.40 |
1952 | -50.70 | -45.80 | -26.00 | -14.10 | 0.70 | 10.60 | 17.30 | 13.10 | 2.30 | -17.70 | -40.50 | -45.30 | -16.40 |
1953 | -46.10 | -45.00 | -27.00 | -12.30 | 5.90 | 11.90 | 14.50 | 9.50 | 3.20 | -14.20 | -34.10 | -43.40 | -15.20 |
1954 | -45.50 | -39.00 | -27.00 | -10.90 | -0.70 | 13.30 | 16.70 | 10.40 | 0.80 | -12.70 | -37.60 | -45.10 | -15.10 |
1955 | -42.80 | -43.00 | -36.00 | -18.70 | 2.70 | 13.20 | 12.90 | 11.80 | 1.70 | -15.00 | -36.70 | -47.30 | -17.40 |
1956 | -47.20 | -40.10 | -29.00 | -19.60 | 1.00 | 16.80 | 14.50 | 9.20 | 2.50 | -20.50 | -34.50 | -42.20 | -16.20 |
1957 | -43.80 | -43.50 | -33.00 | -13.70 | 2.70 | 13.10 | 13.00 | 9.60 | -1.00 | -20.30 | -38.40 | -40.80 | -17.00 |
1958 | -47.60 | -43.60 | -37.00 | -16.70 | -0.10 | 9.70 | 15.00 | 12.80 | 3.50 | -16.70 | -44.40 | -46.50 | -18.50 |
1959 | -46.10 | -42.90 | -23.00 | -15.30 | 3.40 | 13.80 | 12.90 | 10.30 | 4.40 | -15.70 | -32.80 | -49.90 | -15.00 |
1960 | -48.30 | -45.80 | -30.00 | -14.40 | 2.00 | 13.60 | 16.10 | 9.90 | 1.40 | -18.60 | -33.10 | -45.50 | -16.60 |
1961 | -51.20 | -41.60 | -34.20 | -17.90 | 0.10 | 15.00 | 13.70 | 9.90 | 4.00 | -17.00 | -36.20 | -41.00 | -17.30 |
1962 | -46.70 | -45.00 | -31.30 | -11.70 | 3.30 | 10.20 | 13.30 | 10.60 | 0.40 | -11.80 | -38.30 | -47.40 | -16.80 |
1963 | -42.80 | -38.30 | -29.20 | -14.70 | -2.40 | 10.40 | 14.40 | 11.40 | 2.30 | -14.80 | -32.60 | -40.90 | -15.40 |
1964 | -48.00 | -39.60 | -26.40 | -13.50 | 1.60 | 15.70 | 13.70 | 10.00 | 0.50 | -17.20 | -42.20 | -46.60 | -16.00 |
1965 | -47.50 | -46.00 | -31.30 | -14.50 | 1.00 | 12.80 | 18.30 | 10.60 | 4.30 | -13.30 | -36.40 | -49.70 | -16.60 |
1966 | -51.20 | -49.10 | -33.40 | -16.40 | 3.90 | 14.10 | 13.30 | 12.50 | 2.50 | -16.20 | -36.50 | -43.80 | -17.50 |
1967 | -52.20 | -45.40 | -31.30 | -13.80 | 3.00 | 14.00 | 14.30 | 10.00 | 2.30 | -11.60 | -32.90 | -47.30 | -16.70 |
1968 | -46.50 | -35.80 | -32.70 | -14.40 | 2.40 | 14.10 | 13.90 | 11.10 | 2.80 | -14.10 | -40.40 | -43.60 | -16.00 |
1969 | -44.80 | -48.50 | -34.10 | -15.00 | 1.40 | 14.10 | 15.20 | 12.60 | 1.20 | -15.40 | -36.90 | -41.60 | -16.90 |
1970 | -44.80 | -42.90 | -30.50 | -16.00 | -0.20 | 12.10 | 15.00 | 8.40 | 3.60 | -16.30 | -37.00 | -42.40 | -16.50 |
1971 | -50.40 | -44.00 | -30.40 | -14.00 | 5.40 | 11.80 | 18.40 | 11.50 | 5.20 | -10.00 | -35.40 | -43.40 | -15.40 |
1972 | -51.00 | -46.70 | -29.60 | -11.30 | 3.50 | 10.30 | 14.00 | 8.10 | 2.60 | -9.40 | -41.10 | -44.00 | -16.80 |
1973 | -45.70 | -39.20 | -31.60 | -14.20 | 6.40 | 14.10 | 18.40 | 12.60 | 3.10 | -14.50 | -37.70 | -46.00 | -15.20 |
1974 | -47.40 | -45.20 | -31.60 | -10.10 | 4.40 | 12.90 | 17.00 | 11.50 | 1.70 | -19.00 | -40.10 | -47.30 | -16.60 |
1975 | -44.80 | -43.70 | -26.30 | -11.00 | 6.20 | 15.80 | 14.30 | 10.30 | 1.40 | -13.10 | -30.70 | -37.80 | -13.80 |
1976 | -45.30 | -44.90 | -32.40 | -9.00 | 3.80 | 11.60 | 14.40 | 10.80 | 2.30 | -17.90 | -38.40 | -46.80 | -16.60 |
1977 | -43.20 | -45.70 | -33.70 | -10.50 | 4.50 | 14.70 | 15.00 | 9.30 | 0.70 | -18.80 | -37.60 | -46.00 | -16.60 |
1978 | -46.90 | -40.70 | -24.70 | -11.60 | -1.40 | 12.60 | 12.70 | 11.40 | 3.00 | -12.50 | -30.00 | -42.10 | -14.50 |
1979 | -46.90 | -45.20 | -33.80 | -15.40 | 2.40 | 11.60 | 12.90 | 8.90 | 0.00 | -18.40 | -42.10 | -40.40 | -17.90 |
1980 | -43.90 | -42.30 | -32.20 | -17.00 | 2.70 | 11.70 | 16.20 | 13.90 | 2.90 | -14.70 | -38.70 | -41.10 | -16.00 |
1981 | -40.20 | -38.80 | -30.70 | -10.50 | 3.80 | 13.60 | 15.00 | 11.90 | 0.40 | -14.70 | -38.00 | -41.10 | -14.70 |
1982 | -53.10 | -43.40 | -33.80 | -9.50 | 0.20 | 10.10 | 18.40 | 9.40 | 3.80 | -18.00 | -44.00 | -46.60 | -17.80 |
1983 | -47.00 | -42.60 | -30.50 | -15.20 | 4.00 | 14.30 | 15.90 | 13.90 | 5.70 | -16.00 | -31.80 | -43.80 | -15.20 |
1984 | -42.50 | -46.50 | -31.50 | -9.90 | 5.80 | 10.30 | 14.10 | 8.50 | -0.40 | -15.30 | -34.80 | -46.80 | -16.30 |
1985
|
-48.20
|
-34.50
|
-29.30
|
-13.10
|
2.90
|
12.20
|
14.70
|
9.90
|
3.00
|
-15.70
|
-33.10
|
-39.00
|
-14.90
|
1986
|
-47.10
|
-41.30
|
-29.00
|
-11.90
|
0.40
|
14.80
|
14.30
|
10.60
|
2.60
|
-12.40
|
-35.80
|
-41.40
|
-15.30
|
1987
|
-48.70
|
-43.30
|
-32.00
|
-16.90
|
-0.80
|
10.90
|
16.60
|
10.60
|
0.20
|
-17.90
|
-37.40
|
-47.80
|
-17.70
|
1988
|
-46.80
|
-41.50
|
-28.90
|
-9.30
|
5.10
|
14.60
|
19.80
|
9.20
|
5.90
|
-10.10
|
-31.70
|
-38.90
|
-13.60
|
1989
|
-46.80
|
-38.40
|
-24.40
|
-14.40
|
2.70
|
12.50
|
15.30
|
11.30
|
3.00
|
-17.70
|
-34.00
|
-40.60
|
-14.50
|
1990
|
-46.50
|
-41.00
|
-28.20
|
-10.10
|
7.90
|
14.10
|
11.40
|
12.10
|
0.40
|
-12.20
|
-38.60
|
-41.80
|
-14.80
|
1991
|
-41.30
|
-43.50
|
-31.80
|
-14.50
|
0.30
|
9.80
|
20.40
|
15.30
|
1.40
|
-11.90
|
-31.80
|
-40.40
|
-14.90
|
1992
|
-46.10
|
-41.80
|
-29.10
|
-13.40
|
3.10
|
12.60
|
14.50
|
8.00
|
1.60
|
-14.30
|
-40.80
|
-42.40
|
-16.10
|
1993
|
-40.40
|
-44.20
|
-28.20
|
-12.80
|
4.80
|
13.20
|
15.00
|
10.70
|
2.70
|
-13.70
|
-37.60
|
-48.20
|
-15.20
|
1994
|
-47.30
|
-40.20
|
-32.70
|
-14.70
|
6.00
|
13.90
|
16.10
|
9.80
|
3.80
|
-12.00
|
-32.90
|
-45.40
|
-15.60
|
1995
|
-47.40
|
-33.80
|
-30.80
|
-15.10
|
2.90
|
15.50
|
16.90
|
12.70
|
6.40
|
-9.50
|
-32.20
|
-43.10
|
-14.10
|
1996
|
-44.10
|
-36.50
|
-26.40
|
-8.60
|
5.00
|
12.20
|
15.30
|
13.20
|
3.40
|
-13.40
|
-35.20
|
-46.20
|
-13.70
|
1997
|
-40.60
|
-39.50
|
-28.20
|
-10.70
|
4.50
|
15.70
|
21.20
|
15.90
|
3.40
|
-9.70
|
-36.00
|
-45.80
|
-13.00
|
1998
|
-43.90
|
-39.10
|
-27.60
|
-11.60
|
1.90
|
16.60
|
17.30
|
10.40
|
1.90
|
-18.70
|
-35.70
|
-46.20
|
-14.80
|
1999
|
-44.40
|
-44.60
|
-35.50
|
-14.30
|
2.70
|
15.80
|
16.30
|
11.50
|
1.90
|
-13.00
|
-36.30
|
-42.20
|
-16.30
|
2000
|
-45.40
|
-39.50
|
-31.20
|
-9.00
|
4.70
|
13.70
|
16.30
|
10.50
|
3.10
|
-16.30
|
-39.70
|
-45.60
|
-15.40
|