S INDICES 1881 to 2003 derived from "objective" Lamb daily weather types January Feb March April May June July August Sept October Nov Dec Winter Spring Summer Autumn 1881 -3 7 -1 9 4 -4 -1 -5 3 2 27 12 2 12 -10 32 1882 18 13 0 3 14 6 8 2 -3 17 -4 8 43 17 16 10 1883 18 23 -19 6 -6 2 -1 -3 -2 -2 0 1 49 -19 -2 -4 1884 6 21 26 6 5 -7 18 25 9 -10 -6 6 28 37 36 -7 1885 28 9 -3 8 -2 4 6 -8 4 -17 11 -4 43 3 2 -2 1886 -8 18 18 5 5 -5 2 6 13 19 -2 -14 6 28 3 30 1887 17 8 -4 -7 -7 3 3 1 -9 -16 -7 -15 11 -18 7 -32 1888 4 -15 -10 -7 8 8 -6 7 3 -2 16 17 -26 -9 9 17 1889 2 -24 6 1 22 8 -4 -8 2 0 4 19 -5 29 -4 6 1890 15 14 5 -8 19 4 -10 -11 10 -7 10 21 48 16 -17 13 1891 3 9 -15 16 -2 13 -6 -6 16 17 8 3 33 -1 1 41 1892 4 4 6 3 8 -6 1 1 3 -12 28 0 11 17 -4 19 1893 -6 11 5 10 10 2 -5 14 -9 -6 -12 11 5 25 11 -27 1894 16 10 3 22 -9 2 9 -5 -7 -5 21 -3 37 16 6 9 1895 -19 5 5 9 7 -3 -10 10 5 -15 16 6 -17 21 -3 6 1896 6 11 0 -7 -3 -12 4 -31 1 -14 2 13 23 -10 -39 -11 1897 -2 11 1 13 -3 7 -1 12 3 5 12 18 22 11 18 20 1898 5 -12 -13 17 -15 2 -9 12 12 9 2 5 11 -11 5 23 1899 9 26 0 -2 1 8 8 12 -11 -5 6 19 40 -1 28 -10 1900 6 -5 -16 -3 3 7 9 -6 5 6 12 21 20 -16 10 23 1901 23 -14 -6 11 4 1 10 -1 19 3 0 -3 30 9 10 22 1902 -4 21 -2 13 -32 -3 -29 6 5 4 29 15 14 -21 -26 38 1903 21 14 19 -17 -8 -2 -4 0 21 1 -8 18 50 -6 -6 14 1904 18 16 15 -4 13 10 19 1 26 -3 -7 4 52 24 30 16 1905 13 1 12 2 8 -11 -2 5 4 -10 -3 22 18 22 -8 -9 1906 16 -3 -10 -7 -2 -1 20 1 -2 16 -3 -8 35 -19 20 11 1907 0 -1 0 4 11 12 -7 1 9 10 7 25 -9 15 6 26 1908 5 -7 10 -19 8 2 3 -4 15 40 9 24 23 -1 1 64 1909 8 4 -11 11 10 -22 -9 0 0 10 2 2 36 10 -31 12 1910 5 11 7 4 -8 -11 -7 0 -12 10 -5 9 18 3 -18 -7 1911 9 3 1 -1 9 5 8 16 6 -4 7 24 21 9 29 9 1912 14 15 24 3 12 3 -9 -8 -8 11 -2 21 53 39 -14 1 1913 31 2 14 13 11 9 -19 -11 19 30 12 -6 54 38 -21 61 1914 16 20 5 18 -1 -1 17 10 7 2 1 10 30 22 26 10 1915 -3 6 -6 -6 4 7 -2 -11 7 26 -11 8 13 -8 -6 22 1916 6 -7 -4 -2 2 -19 -8 -1 -2 17 8 -4 7 -4 -28 23 1917 -1 7 2 -14 14 15 8 -3 9 -7 1 -12 2 2 20 3 1918 5 22 18 -3 18 -9 4 4 -2 6 20 7 15 33 -1 24 1919 13 19 1 -21 24 4 -10 -5 1 -18 -21 19 39 4 -11 -38 1920 4 8 9 -7 9 20 3 -10 21 22 33 23 31 11 13 76 1921 7 17 5 -1 -7 -8 10 -18 14 6 35 -1 47 -3 -16 55 1922 14 26 0 -7 14 0 -9 -1 6 10 -7 10 39 7 -10 9 1923 -6 30 20 9 -15 -18 7 -1 7 10 -10 -10 34 14 -12 7 1924 26 -6 -8 -14 7 7 4 -4 8 15 30 15 10 -15 7 53 1925 17 0 -8 -2 11 -15 -3 8 -19 0 -13 -7 32 1 -10 -32 1926 21 29 8 18 -7 -6 10 12 8 0 15 -13 43 19 16 23 1927 7 13 0 -4 -1 -12 5 -3 2 -6 11 20 7 -5 -10 7 1928 8 13 22 -6 -2 4 4 0 7 14 -1 13 41 14 8 20 1929 5 38 13 -6 11 6 -7 4 4 -8 12 15 56 18 3 8 1930 18 6 2 -17 6 5 -7 7 1 14 2 7 39 -9 5 17 1931 -11 5 8 -15 11 6 -10 -11 -6 -4 20 -4 1 4 -15 10 1932 17 4 11 -10 1 -13 -5 11 -10 -14 0 24 17 2 -7 -24 1933 17 -6 20 7 0 -5 4 12 5 -3 2 9 35 27 11 4 1934 8 -10 -9 2 13 17 3 -1 18 -4 -5 29 7 6 19 9 1935 -10 0 -4 -8 -5 18 7 5 2 -1 11 -4 19 -17 30 12 1936 -4 18 14 -8 -3 -1 5 -9 5 7 -12 6 10 3 -5 0 1937 21 -3 -18 8 12 -15 -9 7 4 2 7 1 24 2 -17 13 1938 2 6 4 -7 0 1 7 5 9 6 14 17 9 -3 13 29 1939 -3 13 -6 8 2 -15 5 5 6 -9 10 -4 27 4 -5 7 1940 15 24 8 11 11 2 -7 -9 -9 17 4 2 35 30 -14 12 1941 3 2 -9 9 -5 -2 -5 -11 13 1 19 -2 7 -5 -18 33 1942 11 8 27 13 -1 -20 -5 14 -3 0 2 22 17 39 -11 -1 1943 9 4 9 -1 6 13 5 -2 -2 26 -13 4 35 14 16 11 1944 6 -10 -14 9 -7 1 6 6 -1 -4 -5 4 0 -12 13 -10 1945 -18 18 6 -8 8 11 3 -1 5 9 30 11 4 6 13 44 1946 18 -13 18 -2 -4 16 10 9 10 9 -5 11 16 12 35 14 1947 28 9 10 2 21 12 8 0 7 16 -11 3 48 33 20 12 1948 17 10 22 0 2 -7 -10 -13 6 10 13 25 30 24 -30 29 1949 0 13 5 11 6 5 -3 -3 11 20 1 1 38 22 -1 32 1950 22 15 7 -10 -4 6 12 17 4 18 1 -8 38 -7 35 23 1951 12 3 -4 -13 -2 -4 4 3 25 29 7 6 7 -19 3 61 1952 -6 -21 13 -1 7 -6 -12 -6 -32 7 -13 -2 -21 19 -24 -38 1953 7 -5 7 -4 6 -25 -4 9 4 13 16 28 0 9 -20 33 1954 8 14 26 6 15 -1 -5 -8 8 10 5 0 50 47 -14 23 1955 5 -6 -13 4 -13 9 -5 -11 7 -8 8 11 -1 -22 -7 7 1956 1 -5 27 -9 1 -15 7 -12 20 -4 -3 20 7 19 -20 13 1957 11 14 34 -1 5 0 -20 -7 -6 8 7 1 45 38 -27 9 1958 5 -8 1 -3 -1 20 4 19 25 3 -1 -4 -2 -3 43 27 1959 -18 23 25 2 -4 13 6 6 9 24 17 9 1 23 25 50 1960 15 -2 16 2 19 20 3 -24 7 1 12 7 22 37 -1 20 1961 19 15 -1 16 0 4 -2 -8 13 7 -1 2 41 15 -6 19 1962 9 -7 -7 5 -17 -10 -12 -4 2 8 -17 -5 4 -19 -26 -7 1963 -1 10 20 20 5 -3 -6 -17 -10 19 7 14 4 45 -26 16 1964 15 28 34 -2 22 -2 12 3 16 -5 9 0 57 54 13 20 1965 -3 -9 21 1 6 19 -21 4 -21 21 4 -2 -12 28 2 4 1966 23 19 -9 17 1 18 -11 0 12 5 -12 0 40 9 7 5 1967 7 8 1 -11 -9 3 12 4 8 7 -4 -18 15 -19 19 11 1968 -9 -1 -3 16 3 6 -16 -6 16 18 20 21 -28 16 -16 54 1969 20 -3 12 -12 6 7 2 0 5 22 -13 8 38 6 9 14 1970 21 -6 -20 -13 4 3 -1 -4 10 -4 7 -3 23 -29 -2 13 1971 22 12 4 2 18 -16 4 -6 5 9 -14 6 31 24 -18 0 1972 29 24 20 -4 20 10 -10 6 -8 9 -7 25 59 36 6 -6 1973 15 -4 6 -30 7 6 3 13 5 10 -4 -2 36 -17 22 11 1974 27 2 7 5 14 -3 -10 9 -7 -28 -5 0 27 26 -4 -40 1975 7 19 -28 -6 -11 0 11 14 2 20 5 -11 26 -45 25 27 1976 -12 27 29 2 18 11 5 3 2 25 -4 3 4 49 19 23 1977 -6 13 15 -17 -9 -8 9 -2 12 25 -9 10 10 -11 -1 28 1978 0 8 -2 1 4 7 -9 3 -9 2 12 30 18 3 1 5 1979 4 5 -7 -13 -10 -4 1 1 2 23 0 3 39 -30 -2 25 1980 8 24 4 -16 8 -19 -4 14 9 -1 -9 -12 35 -4 -9 -1 1981 -11 14 6 -10 26 -17 -10 3 11 -16 0 8 -9 22 -24 -5 1982 12 24 0 -3 10 3 7 -5 8 6 8 2 44 7 5 22 1983 -1 -1 -1 -12 -6 -5 11 1 5 4 3 9 0 -19 7 12 1984 7 8 1 12 -23 -16 -5 5 -10 8 12 20 24 -10 -16 10 1985 -5 19 -3 -6 -18 -6 5 12 8 8 -10 5 34 -27 11 6 1986 -7 11 19 -10 16 5 -2 -15 -11 12 7 2 9 25 -12 8 1987 12 13 14 14 -10 -4 -9 -7 4 25 -7 18 27 18 -20 22 1988 8 -8 -12 5 7 -4 5 9 5 16 5 0 18 0 10 26 1989 11 11 14 -5 4 -5 -5 4 3 2 7 13 22 13 -6 12 1990 21 12 8 -10 -7 9 13 10 -2 20 -6 -7 46 -9 32 12 1991 17 5 10 14 -18 -8 5 7 3 8 4 7 15 6 4 15 1992 8 10 -3 -12 10 -2 10 9 6 -19 10 2 25 -5 17 -3 1993 9 -2 21 14 5 -5 0 -19 9 -14 23 -1 9 40 -24 18 1994 7 28 4 1 6 5 17 2 -2 5 19 14 34 11 24 22 1995 1 3 -4 -11 3 -16 15 -2 -12 25 7 7 18 -12 -3 20 1996 37 4 7 15 -8 2 -1 0 7 13 -10 9 48 14 1 10 1997 10 14 4 1 0 0 5 19 3 3 21 9 33 5 24 27 1998 16 6 0 0 -6 6 -12 -5 2 3 10 6 31 -6 -11 15 1999 6 -12 0 6 4 -6 8 8 14 7 -2 -8 0 10 10 19 2000 -3 7 -4 2 6 7 -8 5 17 12 0 17 -4 4 4 29 2001 13 -4 14 -5 2 -3 -10 9 -8 19 -3 -6 26 11 -4 8 2002 17 0 12 14 10 9 -5 2 4 5 23 20 11 36 6 32 2003 -9 14 10 12 12 18 16 -1 8 -11 24 -1 25 34 33 21