year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Mean
1929 9.2 12.8 8.9 12.2 10.5 11.3 8.7 11 9.4 13.7 12.7 17 11.4
1930 13.3 7.7 10.1 10.4 8.9 7.6 11.2 11.6 10.3 13.9 12 11.1 10.7
1931 13.5 13.2 11.9 12.2 8 9.8 10 10.9 8.1 8.9 11.1 13.9 11
1932 12.1 7.7 9.9 13.9 7.9 7.8 8.9 7 9.9 12.2 10.3 11.3 9.9
1933 9.6 13.3 10.4 8.2 7.7 8.2 8.2 8.3 7 11.8 9.1 8.4 9.2
1934 13.2 10.3 10.3 9.6 10.9 8.2 9.7 10.5 10.7 14.3 7.2 11.5 10.6
1935 12.9 15.5 11.3 12.3 10.1 7.5 9.7 6.8 12.2 13.9 11.1 10.7 11.2
1936 11.5 12.9 10.5 11 9.1 8.6 11.3 9.4 9.5 14.5 12 15.9 11.3
1937 15.8 16 10.6 11 8.1 9.1 8.9 6.6 9 8.2 9 8.8 10.1
1938 14.2 13.8 10.8 8.2 8.7 11.9 9.2 8.2 7.6 13.5 12.9 14.2 11.1
1939 14.6 15.3 14.7 12.5 7.9 9.6 9.5 6.7 7.9 10.2 12.6 10.9 11
1940 12.3 8.5 7.8 8.3 7.4 6.9 9.5 12.6 11.8 9.3 12.3 12.9 10
1941 10.9 12.9 10.8 11 8.3 7.1 7.4 11.4 7 10.5 9.6 10.8 9.8
1942 12.6 10.1 10.6 15 11.5 8 10.6 8.1 9.4 10.5 5.9 11.9 10.3
1943 11.5 13.6 9 12.4 8.8 10.3 9.5 10.9 9.5 9.7 12.7 9.6 10.6
1944 13.6 10.9 8.8 9.4 7.3 9.9 6.6 5.6 9.9 9.1 10.5 11.2 9.4
1945 10.8 12.7 8.4 7.8 5.7 8.1 6 3.8 5.3 5 3.2 10.6 7.3
1946 11.6 15.5 8.9 8.9 8.9 9.3 8.8 7.7 11 8.7 11.4 11.5 10.2
1947 13.4 11.6 10.7 14 7.9 6.9 6.5 5.6 9.4 7 12.9 11.9 9.8
1948 14.3 12.9 10.9 9.5 7.2 9.4 10.3 9.6 10.5 10.2 10.1 10.7 10.5
1949 12.6 11.9 9.5 10.3 7.6 6.9 7.8 7.6 6.8 8.3 11.4 13.3 9.5
1950 9.3 12.2 9.2 12.9 8.2 8.5 8.6 8.3 12.6 9.5 10.6 10.1 10
1951 10.5 8.9 7.9 10.7 8.9 7.2 7.2 7.2 8.8 7.6 11.8 12.7 9.1
1952 12.2 7 6.9 5.1 4.5 5.5 5.9 5.4 12.6 13.3 11.5 11.4 8.5
1953 8.9 10.1 8.4 10.6 10.5 8.7 12.9 11.2 12 9.3 11.3 10.9 10.4
1954 13.9 8.6 11.5 9.8 10.1 9.6 12 8.7 14 12.3 12.1 17.5 11.7
1955 10.9 10 8.4 7.8 11.1 9 6.3 6.5 10.6 11.1 9.1 14.9 9.7
1956 12.5 7.1 11.8 8.7 9.9 11.9 10 9 10.4 11.5 12.4 12.7 10.7
1957 9.7 9.4 11.2 7.6 8.8 6.3 8.9 12.5 12 9.4 8.9 11.2 9.7
1958 11.5 11.6 9.6 8.7 8.3 5.3 6.7 6.6 7.9 8.9 5.9 7.8 8.2
1959 7.9 8.2 7 8.1 6.7 8.3 5.3 5.8 3.6 9.6 9.2 12.2 7.7
1960 10.4 10.2 12.5 10 8.2 9.1 10.5 7.7 9.3 9.4 12.4 10.4 10
1993 15.5 10.9 11.4 9.8 10.3 8.2 12.1 8.6 9.2 7 9.5 15.1 10.6
1994 14.4 12 16 12.2 9.5 11.3 6.9 8 10.1 10.5 10.5 12.6 11.2
1995 14.1 13.2 13.9 10.6 9.5 10 9 7.8 9.6 10.4 9.5 8.8 10.5
1996 12.2 11.2 9.6 8.4 9.3 8.8 8.6 7.6 7.8 11.5 12 9.9 9.7
1997 7.7 15.2 12.3 9.8 8.4 9.7 8.8 7.6 10.5 9.6 9.5 11.3 10
1998 11 12.4 11.4 9.5 9.1 9.9 11.9 10.7 10.1 14.2 11.2 10.8 11
1999 11.8 14.7 10.8 10.7 9.4 9.5 9 8.5 8.3 11.1 10.3 14.2 10.7
2000 10.4 14.4 11 7.4 8.4 8.3 7.4 6.6 7.3 10.7 11.5 10.5 9.5
2001 8.2 5.1 5.1 5.9 4.4 4.9 4.1 3.3 5.4 8.6 8.9 9.4 5.4
2002 11.1 15.4 10.7 9.2 9.5 8.6 6.8