YEAR JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC D-J-F M-A-M J-J-A S-O-N metANN 1897 24.6 22.1 21.3 19.0 16.0 13.7 13.6 12.3 14.8 14.9 18.4 21.2 22.6 18.8 13.2 16.0 17.66 1898 23.3 24.7 22.8 19.0 16.4 12.2 13.7 14.1 15.6 16.3 18.3 21.6 23.1 19.4 13.3 16.7 18.13 1899 23.3 23.6 21.6 18.1 15.5 13.5 13.0 13.3 14.5 16.9 17.7 22.0 22.8 18.4 13.3 16.4 17.72 1900 22.4 24.6 19.4 18.4 15.3 14.6 12.9 13.1 14.0 17.6 19.9 21.4 23.0 17.7 13.5 17.2 17.85 1901 23.2 23.2 21.7 19.9 15.6 13.2 12.3 13.2 14.8 16.7 18.8 20.0 22.6 19.1 12.9 16.8 17.83 1902 21.3 21.5 23.7 19.5 16.1 13.1 12.4 14.5 14.3 15.3 18.5 19.3 20.9 19.8 13.3 16.0 17.52 1903 23.7 24.2 19.3 17.2 16.4 14.2 12.7 13.0 13.8 15.9 19.3 21.8 22.4 17.6 13.3 16.3 17.42 1904 24.1 22.9 23.8 19.2 14.6 13.9 12.4 13.8 14.8 15.7 19.0 21.7 22.9 19.2 13.4 16.5 18.00 1905 21.2 22.9 21.0 19.2 16.5 13.5 12.9 12.2 14.0 16.3 18.3 23.0 21.9 18.9 12.9 16.2 17.48 1906 23.7 21.7 22.7 20.7 16.4 14.6 12.0 13.3 13.1 17.1 18.8 23.4 22.8 19.9 13.3 16.3 18.09 1907 24.0 24.5 22.8 19.7 16.6 14.1 13.7 14.5 14.6 15.7 18.0 20.2 24.0 19.7 14.1 16.1 18.47 1908 21.9 22.7 20.4 18.8 15.6 11.9 12.8 12.8 14.2 16.6 19.1 22.3 21.6 18.3 12.5 16.6 17.25 1909 23.9 24.1 21.8 18.4 15.8 13.8 12.0 13.1 15.4 15.2 17.4 24.2 23.4 18.7 13.0 16.0 17.77 1910 23.2 25.4 23.2 20.9 15.8 13.7 12.5 13.8 15.4 14.5 18.4 20.7 24.3 20.0 13.3 16.1 18.42 1911 23.2 23.6 21.3 19.0 14.8 12.8 13.1 12.6 14.1 17.1 19.0 20.1 22.5 18.4 12.8 16.7 17.61 1912 23.8 24.1 22.0 20.2 16.4 14.1 13.0 14.0 13.9 16.0 18.8 21.5 22.7 19.5 13.7 16.2 18.03 1913 22.9 23.8 21.9 19.0 16.4 14.4 12.7 12.8 14.8 15.4 18.4 19.9 22.7 19.1 13.3 16.2 17.83 1914 24.0 22.2 21.2 16.7 14.9 13.8 12.3 14.6 16.2 18.8 19.5 22.0 22.0 17.6 13.6 18.2 17.84 1915 24.9 23.8 21.0 20.4 16.5 15.1 13.6 13.9 13.7 16.3 20.6 24.0 23.6 19.3 14.2 16.9 18.48 1916 22.1 22.8 21.0 18.9 16.2 13.1 11.9 12.9 16.2 15.5 19.6 21.6 23.0 18.7 12.6 17.1 17.85 1917 23.0 22.5 19.8 18.7 14.5 13.5 13.2 12.5 13.9 15.7 18.9 20.3 22.4 17.7 13.1 16.2 17.32 1918 25.5 23.7 21.3 20.7 16.3 15.2 12.9 13.1 15.8 16.0 20.1 21.4 23.2 19.4 13.7 17.3 18.41 1919 21.9 22.2 23.2 19.1 15.8 13.8 14.6 13.1 13.3 14.8 18.7 20.0 21.8 19.4 13.8 15.6 17.66 1920 25.5 23.1 22.0 20.3 16.0 13.9 12.3 12.6 15.0 17.0 21.6 21.6 22.9 19.4 12.9 17.9 18.28 1921 24.0 27.5 24.1 19.3 16.9 15.1 14.9 14.0 14.1 16.0 18.2 23.4 24.4 20.1 14.7 16.1 18.81 1922 22.2 22.9 22.6 18.7 15.4 13.4 11.9 13.9 14.3 16.7 19.1 19.2 22.8 18.9 13.1 16.7 17.88 1923 21.5 24.3 23.3 20.5 16.8 13.4 13.3 13.7 13.6 15.4 19.3 21.2 21.7 20.2 13.5 16.1 17.86 1924 21.8 23.2 21.1 21.1 16.5 14.1 14.2 12.5 14.8 14.7 18.5 22.1 22.1 19.6 13.6 16.0 17.81 1925 22.4 21.8 21.8 18.9 16.2 14.5 12.0 12.7 14.9 15.4 21.0 21.9 22.1 19.0 13.1 17.1 17.81 1926 25.2 21.4 21.1 18.4 15.8 13.8 13.2 13.1 15.0 16.5 19.6 22.2 22.8 18.4 13.4 17.0 17.92 1927 21.9 22.3 20.2 21.4 15.6 13.4 12.6 13.8 15.8 16.9 19.6 24.1 22.1 19.1 13.3 17.4 17.98 1928 23.3 22.8 21.0 19.5 16.4 14.8 13.1 14.1 14.7 14.6 19.3 21.8 23.4 19.0 14.0 16.2 18.14 1929 22.7 23.7 21.3 17.9 15.5 13.2 12.2 13.4 14.4 16.5 18.6 21.8 22.7 18.2 12.9 16.5 17.60 1930 23.6 23.1 24.3 19.8 17.1 15.7 13.5 13.8 15.3 16.4 19.5 21.2 22.8 20.4 14.3 17.1 18.66 1931 23.7 21.6 22.7 18.8 14.2 11.6 13.5 13.4 14.0 17.4 20.1 25.5 22.2 18.6 12.8 17.2 17.68 1932 25.5 24.9 21.2 18.8 17.0 13.9 13.7 12.4 14.9 16.4 18.9 21.3 25.3 19.0 13.3 16.7 18.59 1933 23.7 25.9 22.0 20.2 16.1 15.3 12.4 13.1 15.3 16.2 21.0 23.0 23.6 19.4 13.6 17.5 18.54 1934 25.1 25.6 23.3 18.7 18.2 13.6 12.8 13.9 15.0 15.5 18.1 21.2 24.6 20.1 13.4 16.2 18.57 1935 23.7 23.3 21.6 19.5 17.0 13.6 12.9 13.4 14.1 15.3 18.3 20.7 22.7 19.4 13.3 15.9 17.83 1936 23.0 23.1 23.6 19.7 15.5 13.6 12.6 14.7 16.5 16.7 20.8 22.9 22.3 19.6 13.6 18.0 18.38 1937 23.3 24.4 22.1 21.1 16.5 13.7 12.9 13.5 14.4 16.9 20.1 20.9 23.5 19.9 13.4 17.1 18.48 1938 22.8 22.3 21.3 18.8 16.2 13.4 13.5 14.0 16.1 16.4 19.3 21.6 22.0 18.8 13.6 17.3 17.92 1939 21.0 23.9 22.6 19.4 16.1 13.9 12.9 13.3 15.4 17.3 19.3 22.5 22.2 19.4 13.4 17.3 18.06 1940 23.4 25.3 21.7 18.5 16.0 15.3 13.2 14.2 14.9 16.7 20.4 20.8 23.7 18.7 14.2 17.3 18.51 1941 24.1 24.1 21.1 18.4 16.7 15.0 13.9 14.2 13.9 16.5 18.5 22.7 23.0 18.7 14.4 16.3 18.10 1942 23.1 23.6 21.0 19.2 15.7 13.7 12.4 13.7 14.2 15.3 20.2 22.8 23.1 18.6 13.3 16.6 17.90 1943 22.3 23.0 22.5 18.9 15.5 14.1 11.7 12.8 14.3 15.8 20.5 21.6 22.7 19.0 12.9 16.9 17.85 1944 24.0 23.8 21.4 18.9 15.1 15.0 13.6 14.1 14.7 18.3 20.5 19.7 23.1 18.5 14.2 17.8 18.42 1945 23.0 24.6 22.7 21.7 17.3 14.8 13.1 13.7 14.0 17.2 19.6 21.4 22.4 20.6 13.9 16.9 18.45 1946 21.3 22.2 21.2 19.7 16.3 13.4 13.5 12.7 15.8 17.6 18.4 20.9 21.6 19.1 13.2 17.3 17.79 1947 22.7 24.3 23.1 19.2 15.4 15.5 13.4 12.9 14.3 15.8 18.7 19.8 22.6 19.2 13.9 16.3 18.02 1948 23.5 24.8 25.0 18.5 16.7 14.4 13.6 14.7 14.5 16.8 18.4 20.0 22.7 20.1 14.2 16.6 18.39 1949 24.7 24.6 22.3 21.2 16.3 15.5 14.9 15.0 14.7 15.3 19.3 22.5 23.1 19.9 15.1 16.4 18.65 1950 24.8 24.2 23.3 20.8 16.2 14.2 13.7 13.9 14.6 15.2 17.6 20.5 23.8 20.1 13.9 15.8 18.42 1951 21.8 23.4 22.3 18.7 14.8 13.8 12.3 12.2 15.6 16.3 18.7 20.6 21.9 18.6 12.8 16.9 17.53 1952 23.5 24.1 22.6 20.1 15.6 15.0 12.1 13.5 13.9 15.6 17.5 19.6 22.7 19.4 13.5 15.7 17.84 1953 23.2 24.9 22.6 18.8 16.5 14.0 13.3 12.9 15.2 15.5 18.5 20.0 22.6 19.3 13.4 16.4 17.92 1954 24.4 24.5 21.4 17.7 15.6 13.5 12.9 13.5 16.2 17.8 16.8 21.2 23.0 18.2 13.3 16.9 17.86 1955 24.5 25.6 23.5 18.6 15.3 11.8 12.5 14.0 14.4 14.8 18.3 21.4 23.8 19.1 12.8 15.8 17.88 1956 25.6 24.3 23.2 18.1 14.7 12.2 12.5 11.7 14.5 15.3 19.5 20.7 23.8 18.7 12.1 16.4 17.75 1957 24.5 23.7 22.0 18.9 16.8 14.8 11.8 14.1 14.6 17.0 20.1 22.1 23.0 19.2 13.6 17.2 18.25 1958 25.5 24.2 23.0 18.7 17.1 14.2 12.5 12.8 14.0 15.5 20.7 24.0 23.9 19.6 13.2 16.7 18.36 1959 23.3 24.6 23.5 18.9 17.1 15.4 14.8 15.1 15.4 16.6 19.5 20.7 24.0 19.8 15.1 17.2 19.02 1960 21.4 23.9 20.4 17.4 14.3 13.2 12.2 12.3 14.1 17.2 19.4 23.0 22.0 17.4 12.6 16.9 17.21 1961 26.3 25.4 23.1 17.4 17.0 14.5 12.8 13.7 16.1 17.3 20.0 22.4 24.9 19.2 13.7 17.8 18.88 1962 27.6 24.8 21.2 21.1 18.1 15.2 12.8 14.2 14.4 15.0 19.1 23.3 24.9 20.1 14.1 16.2 18.83 1963 24.7 24.6 24.1 20.0 16.6 13.8 13.5 14.0 15.6 18.1 20.5 22.7 24.2 20.2 13.8 18.1 19.07 1964 23.5 23.9 22.8 18.2 15.9 16.0 14.2 13.8 13.9 14.9 17.9 20.9 23.4 19.0 14.7 15.6 18.14 1965 25.3 23.5 22.6 20.6 15.9 14.7 13.1 13.4 14.6 17.2 18.7 23.6 23.2 19.7 13.7 16.8 18.38 1966 24.0 23.2 22.3 18.5 16.3 13.5 13.4 13.1 13.9 16.4 19.6 21.6 23.6 19.0 13.3 16.6 18.15 1967 24.1 25.9 22.0 20.1 16.7 15.9 13.0 13.4 15.8 18.9 20.2 22.6 23.9 19.6 14.1 18.3 18.97 1968 24.3 23.3 20.6 17.0 14.5 14.2 13.6 12.2 13.9 16.3 18.0 21.7 23.4 17.4 13.3 16.1 17.54 1969 22.2 23.9 22.2 19.7 16.6 15.1 13.3 13.7 14.6 20.0 20.8 22.6 22.6 19.5 14.0 18.5 18.65 1970 23.0 25.9 23.8 18.3 16.6 15.2 14.8 14.1 14.9 17.4 19.0 23.0 23.8 19.6 14.7 17.1 18.80 1971 23.7 24.1 23.2 18.9 16.4 14.8 14.0 13.7 14.8 15.5 17.1 20.7 23.6 19.5 14.2 15.8 18.27 1972 24.9 26.8 23.7 19.7 18.9 15.1 13.5 13.9 15.8 17.4 21.8 24.9 24.1 20.8 14.2 18.3 19.35 1973 25.3 23.5 22.9 19.6 17.2 13.5 14.5 13.8 14.6 17.1 20.8 21.9 24.6 19.9 13.9 17.5 18.98 1974 26.5 24.5 24.4 19.3 16.4 14.9 13.9 14.4 16.6 16.1 18.6 22.5 24.3 20.0 14.4 17.1 18.96 1975 23.1 27.8 22.5 19.4 16.7 15.3 14.5 13.7 15.2 17.2 19.1 23.5 24.5 19.5 14.5 17.2 18.92 1976 24.3 27.0 24.3 21.0 18.1 15.1 15.3 14.9 16.0 18.7 18.5 22.0 24.9 21.1 15.1 17.7 19.73 1977 24.4 26.1 21.9 21.4 16.4 15.4 15.0 15.3 15.2 18.0 20.5 25.2 24.2 19.9 15.2 17.9 19.30 1978 27.1 26.2 25.9 22.8 17.0 14.2 13.3 14.8 14.6 18.1 21.5 23.7 26.2 21.9 14.1 18.1 20.06 1979 24.3 25.1 23.9 19.3 16.2 15.3 14.0 13.3 14.5 17.9 20.3 23.9 24.4 19.8 14.2 17.6 18.98 1980 26.3 24.9 24.6 18.1 17.7 14.4 14.1 14.9 15.6 15.7 19.2 21.4 25.0 20.1 14.5 16.8 19.12 1981 25.8 22.6 23.3 21.3 17.3 13.1 13.7 14.1 16.4 17.5 18.7 21.5 23.3 20.6 13.6 17.5 18.77 1982 22.7 25.3 22.1 20.0 16.5 14.0 13.4 14.7 15.7 18.5 22.0 22.3 23.2 19.5 14.0 18.7 18.87 1983 25.5 23.2 25.2 20.2 18.2 16.4 14.0 15.7 16.6 18.4 19.9 22.7 23.7 21.2 15.4 18.3 19.63 1984 24.9 25.5 21.4 20.9 16.8 15.0 13.4 13.6 15.4 18.0 20.0 20.0 24.4 19.7 14.0 17.8 18.97 1985 23.2 28.9 24.6 19.9 17.3 15.9 14.5 14.5 16.5 17.6 21.0 20.8 24.0 20.6 15.0 18.4 19.49 1986 26.1 22.9 21.9 19.4 16.7 14.8 12.4 12.9 16.0 15.9 20.3 22.3 23.3 19.3 13.4 17.4 18.34 1987 23.1 24.9 23.9 20.7 16.1 15.9 14.3 14.7 17.0 18.0 19.9 22.7 23.4 20.2 15.0 18.3 19.23 1988 23.5 27.3 25.7 21.4 17.6 16.1 14.3 14.9 16.6 17.6 20.4 22.7 24.5 21.6 15.1 18.2 19.84 1989 25.4 25.0 24.3 20.7 17.6 14.2 13.1 14.5 16.1 15.9 21.7 21.4 24.4 20.9 13.9 17.9 19.27 1990 22.8 25.4 23.7 20.0 16.9 13.4 13.2 13.9 16.4 16.9 20.1 21.9 23.2 20.2 13.5 17.8 18.68 1991 25.4 24.7 23.1 21.9 17.5 15.7 14.2 15.0 15.0 18.6 18.4 22.9 24.0 20.8 15.0 17.3 19.28 1992 26.7 24.4 22.8 21.2 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 24.7 20.4 999.9 999.9 999.90