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 1898 21.3 23.5 19.9 19.4 17.9 13.9 15.3 15.1 16.3 16.8 18.2 20.6 21.8 19.1 14.8 17.1 18.18 1899 22.0 22.2 21.1 18.2 16.6 14.9 14.2 14.4 14.2 16.9 17.6 21.1 21.6 18.6 14.5 16.2 17.74 1900 21.0 22.7 19.2 18.6 16.5 15.6 14.1 13.8 14.5 17.6 19.0 19.9 21.6 18.1 14.5 17.0 17.81 1901 21.8 21.9 20.9 20.0 16.9 14.6 14.0 14.5 15.6 16.8 18.8 19.4 21.2 19.3 14.4 17.1 17.98 1902 20.2 20.2 22.4 20.0 17.5 15.0 14.0 15.5 15.3 15.8 17.9 18.5 19.9 20.0 14.8 16.3 17.77 1903 22.0 22.8 19.2 17.4 17.0 15.6 13.7 14.6 14.5 16.1 18.8 20.7 21.1 17.9 14.6 16.5 17.52 1904 22.7 22.0 22.9 19.8 15.8 15.2 13.7 14.7 15.2 16.3 18.7 20.5 21.8 19.5 14.5 16.7 18.14 1905 20.4 21.1 20.0 19.6 17.0 15.0 14.2 13.3 14.4 16.3 18.1 21.3 20.7 18.9 14.2 16.3 17.49 1906 21.6 20.9 21.9 20.8 17.9 16.0 13.5 14.1 14.0 17.1 18.1 21.6 21.3 20.2 14.5 16.4 18.10 1907 22.3 23.2 22.2 19.9 17.6 15.6 14.9 15.2 15.3 16.1 17.5 19.3 22.4 19.9 15.2 16.3 18.45 1908 20.7 20.8 19.7 18.9 16.5 13.2 13.8 13.7 14.8 16.4 18.4 20.4 20.3 18.4 13.6 16.5 17.18 1909 22.9 23.0 21.3 19.0 17.1 15.4 13.9 14.2 16.1 16.3 17.8 23.2 22.1 19.1 14.5 16.7 18.12 1910 22.6 23.8 22.9 21.6 16.7 15.0 13.5 15.1 16.0 15.4 18.3 20.0 23.2 20.4 14.5 16.6 18.68 1911 22.6 22.5 21.5 19.5 16.4 14.8 14.4 13.9 14.7 16.7 18.6 19.5 21.7 19.1 14.4 16.7 17.97 1912 22.3 23.2 21.2 20.5 17.6 15.7 14.4 15.4 15.0 16.2 18.7 20.8 21.7 19.8 15.2 16.6 18.31 1913 22.1 23.0 21.6 19.6 18.2 16.3 14.6 14.4 16.0 16.3 18.9 19.9 22.0 19.8 15.1 17.1 18.48 1914 22.4 21.7 20.9 18.0 16.4 15.7 14.2 16.1 16.9 19.1 19.3 21.7 21.3 18.4 15.3 18.4 18.38 1915 23.9 23.3 21.2 21.0 17.6 16.3 15.0 14.7 14.1 16.2 20.2 22.2 23.0 19.9 15.3 16.8 18.77 1916 21.1 21.9 20.4 19.5 17.5 14.7 13.6 14.1 16.2 15.8 19.3 20.5 21.7 19.1 14.1 17.1 18.03 1917 22.0 22.1 19.9 19.7 16.2 15.5 14.8 14.0 14.9 16.1 18.5 20.0 21.5 18.6 14.8 16.5 17.85 1918 24.2 22.6 21.2 21.3 17.5 16.4 14.6 14.5 16.5 16.4 20.1 20.7 22.3 20.0 15.2 17.7 18.78 1919 21.0 21.2 22.5 19.9 17.7 15.6 15.8 14.2 14.5 15.3 18.3 19.5 21.0 20.0 15.2 16.0 18.06 1920 24.2 22.3 21.4 20.7 17.1 15.4 13.6 13.4 15.5 17.2 19.7 20.7 22.0 19.7 14.1 17.5 18.33 1921 22.4 25.2 23.3 19.9 17.6 16.5 15.6 14.9 15.0 16.0 17.6 21.2 22.8 20.3 15.7 16.2 18.73 1922 20.8 21.3 21.9 18.9 16.3 14.7 13.3 14.7 14.7 16.7 18.4 18.2 21.1 19.0 14.2 16.6 17.74 1923 20.4 22.7 22.0 19.6 17.4 14.4 14.4 14.5 14.1 15.3 18.1 19.6 20.4 19.7 14.4 15.8 17.59 1924 21.1 21.8 20.1 20.5 17.5 15.6 15.2 13.5 15.2 15.1 17.9 20.4 20.8 19.4 14.8 16.1 17.76 1925 21.2 21.3 21.4 19.0 17.0 15.6 13.8 13.9 15.6 15.9 19.8 21.3 21.0 19.1 14.4 17.1 17.91 1926 23.2 20.9 20.4 18.5 16.7 15.1 14.1 13.9 15.5 16.6 19.3 20.9 21.8 18.5 14.4 17.1 17.96 1927 20.5 21.2 19.7 21.7 17.1 14.7 14.1 14.6 15.8 17.0 19.2 22.4 20.9 19.5 14.5 17.3 18.04 1928 21.5 21.7 21.0 20.0 17.6 16.4 14.3 15.3 15.0 15.1 18.7 20.6 21.9 19.5 15.3 16.3 18.25 1929 20.9 22.6 20.7 18.8 16.3 14.5 13.7 14.0 14.8 16.4 18.5 20.7 21.4 18.6 14.1 16.6 17.65 1930 21.9 21.2 23.2 20.2 18.2 16.6 15.1 14.9 15.3 16.5 19.1 20.8 21.3 20.5 15.5 17.0 18.58 1931 22.7 20.7 21.4 20.0 15.8 13.7 14.4 14.8 14.9 17.0 20.0 24.2 21.4 19.1 14.3 17.3 18.02 1932 24.2 24.2 21.0 19.6 18.2 16.0 14.8 13.5 15.3 16.2 18.7 20.1 24.2 19.6 14.8 16.7 18.83 1933 22.5 24.4 21.4 20.9 17.5 16.7 14.6 14.4 16.3 16.9 20.2 22.0 22.3 19.9 15.2 17.8 18.83 1934 24.1 24.5 23.1 19.8 19.5 15.5 14.3 15.0 15.8 16.0 18.2 20.6 23.5 20.8 14.9 16.7 18.98 1935 22.6 22.2 20.9 19.8 18.2 15.4 14.5 14.5 15.0 15.6 18.1 19.8 21.8 19.6 14.8 16.2 18.12 1936 22.2 22.3 22.5 19.9 17.0 14.9 14.1 15.2 16.8 16.5 20.1 21.4 21.4 19.8 14.7 17.8 18.44 1937 22.1 22.9 21.5 21.2 17.6 15.6 14.7 14.6 15.2 17.4 19.3 19.9 22.1 20.1 15.0 17.3 18.62 1938 21.6 21.2 21.0 19.2 17.4 15.2 14.9 14.7 16.3 16.7 19.0 20.7 20.9 19.2 14.9 17.3 18.09 1939 20.9 22.4 21.8 20.1 17.5 15.4 14.5 14.1 15.9 17.2 19.2 21.1 21.3 19.8 14.7 17.4 18.31 1940 22.4 23.8 21.4 19.0 17.0 16.9 15.0 15.4 15.8 17.2 19.6 20.2 22.4 19.1 15.8 17.5 18.72 1941 22.6 22.7 20.8 18.7 17.8 16.4 15.3 15.4 14.7 16.5 18.6 21.6 21.8 19.1 15.7 16.6 18.31 1942 22.2 22.2 21.0 19.6 17.1 15.5 14.2 14.7 15.1 16.0 19.8 22.1 22.0 19.2 14.8 17.0 18.25 1943 21.3 22.0 22.1 19.2 17.9 999.9 13.7 14.1 15.2 16.2 19.8 20.3 21.8 19.7 14.2 17.1 18.21 1944 22.2 22.1 20.2 19.5 16.5 16.8 14.9 15.1 15.5 18.4 20.2 19.8 21.5 18.7 15.6 18.0 18.48 1945 21.9 23.4 22.0 21.5 18.3 15.8 14.3 14.5 14.7 17.1 19.5 20.5 21.7 20.6 14.9 17.1 18.57 1946 20.7 21.2 20.7 20.0 17.2 15.0 14.0 13.9 15.7 17.3 18.1 20.6 20.8 19.3 14.3 17.0 17.86 1947 21.3 22.3 22.2 19.8 16.8 16.4 14.8 14.5 15.1 16.2 18.0 19.7 21.4 19.6 15.2 16.4 18.17 1948 22.1 23.3 23.7 19.1 18.4 16.3 14.9 15.9 15.4 17.1 18.1 19.4 21.7 20.4 15.7 16.9 18.67 1949 23.2 23.5 22.1 21.4 17.6 17.0 16.2 999.9 999.9 999.9 999.9 999.9 22.0 20.4 16.4 999.9 19.15 1950 999.9 999.9 999.9 999.9 999.9 15.9 15.5 15.0 15.5 16.0 18.0 19.6 999.9 999.9 15.5 16.5 999.90 1951 20.8 22.6 22.0 19.4 16.3 15.2 14.0 13.2 15.8 17.0 18.5 19.8 21.0 19.2 14.1 17.1 17.87 1952 22.1 23.4 22.4 20.3 16.6 16.3 13.8 14.7 14.8 15.7 17.2 18.6 21.8 19.8 14.9 15.9 18.09 1953 21.6 21.6 21.9 19.8 17.8 15.4 14.8 14.2 16.0 16.3 18.0 18.9 20.6 19.8 14.8 16.8 18.00 1954 22.9 23.2 21.1 18.4 16.8 15.4 14.6 14.5 16.3 17.9 17.6 20.2 21.7 18.8 14.8 17.3 18.13 1955 23.0 24.2 22.5 18.9 16.5 14.0 14.4 14.7 15.1 15.7 18.4 20.8 22.5 19.3 14.4 16.4 18.13 1956 24.0 22.8 22.4 18.8 16.1 13.7 13.8 13.5 15.4 15.9 19.0 20.1 22.5 19.1 13.7 16.8 18.02 1957 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1958 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1959 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1960 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1961 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1962 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1963 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1964 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1965 23.8 22.2 21.5 20.3 17.2 15.7 14.3 14.2 15.1 999.9 18.2 22.6 22.4 19.7 14.7 16.5 18.33 1966 23.2 22.7 21.7 18.9 17.6 14.7 14.4 14.2 14.7 16.1 19.0 21.2 22.8 19.4 14.4 16.6 18.32 1967 22.7 24.3 21.9 20.4 17.7 16.6 14.3 14.1 16.0 17.8 19.2 21.2 22.7 20.0 15.0 17.7 18.85 1968 22.6 21.8 19.5 17.4 15.4 14.9 14.6 13.3 14.1 16.1 17.7 20.7 21.9 17.4 14.3 16.0 17.38 1969 21.4 22.1 21.7 19.1 16.9 15.9 14.7 14.6 14.3 18.9 19.3 21.0 21.4 19.2 15.1 17.5 18.30 1970 21.7 24.1 22.5 18.6 17.1 15.8 15.6 999.9 14.7 999.9 18.0 20.8 22.3 19.4 15.5 16.2 18.35 1971 22.4 22.4 21.8 18.8 17.1 15.8 14.8 14.0 14.4 15.4 16.6 19.2 21.9 19.2 14.9 15.5 17.86 1972 22.8 24.8 22.0 19.6 19.0 16.2 14.5 14.3 15.8 16.7 19.8 999.9 22.3 20.2 15.0 17.4 18.73 1973 23.5 22.0 21.4 19.3 17.4 14.3 15.0 14.0 14.7 16.3 19.1 20.5 22.1 19.4 14.4 16.7 18.16 1974 23.6 22.8 22.4 18.8 17.0 15.6 14.7 14.9 16.1 16.1 17.9 20.8 22.3 19.4 15.1 16.7 18.37 1975 21.2 25.0 999.9 18.6 17.9 15.9 15.2 14.1 14.9 17.0 18.7 22.0 22.3 19.3 15.1 16.9 18.38 1976 22.2 24.8 22.5 20.5 18.6 16.0 999.9 14.3 16.0 17.9 17.6 20.6 23.0 20.5 15.0 17.2 18.92 1977 22.0 23.3 20.4 20.3 16.7 15.1 14.3 15.3 15.0 17.2 19.5 22.9 22.0 19.1 14.9 17.2 18.31 1978 24.3 23.2 24.4 21.6 17.1 15.1 13.9 15.0 14.8 17.2 20.3 22.3 23.5 21.0 14.7 17.4 19.15 1979 22.1 22.7 22.5 19.5 16.7 16.1 14.8 13.9 15.0 17.2 19.1 21.7 22.4 19.6 14.9 17.1 18.49 1980 999.9 22.3 22.5 18.8 18.0 14.9 14.5 15.0 15.4 14.8 18.3 19.9 22.2 19.8 14.8 16.2 18.23 1981 23.1 20.8 21.6 20.8 17.5 13.8 14.5 14.2 16.2 17.2 18.1 19.8 21.3 20.0 14.2 17.2 18.14 1982 20.7 22.4 20.8 19.2 17.4 15.0 14.6 15.2 15.7 17.6 20.7 21.2 21.0 19.1 14.9 18.0 18.26 1983 23.5 22.1 23.7 20.4 19.1 17.4 15.0 15.9 16.5 17.6 18.4 21.1 22.3 21.1 16.1 17.5 19.23 1984 23.2 23.2 20.8 20.4 17.4 16.0 14.2 14.4 15.1 17.7 18.9 19.3 22.5 19.5 14.9 17.2 18.53 1985 21.8 25.9 22.8 19.8 17.8 17.1 15.3 14.6 15.9 999.9 19.3 19.7 22.3 20.1 15.7 17.5 18.90 1986 23.5 21.2 20.7 999.9 17.2 14.9 13.4 13.6 15.4 999.9 999.9 999.9 21.5 19.0 14.0 999.9 17.70 1987 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 17.0 999.9 20.7 999.9 999.9 999.9 999.9 999.90 1988 21.7 24.9 23.9 21.1 18.1 16.2 14.8 14.9 16.4 17.4 18.8 20.8 22.4 21.0 15.3 17.5 19.08 1989 23.2 23.0 22.9 19.8 18.2 15.5 14.2 15.0 16.1 15.9 20.4 20.2 22.3 20.3 14.9 17.5 18.75 1990 20.9 24.0 22.1 999.9 999.9 14.3 13.5 13.2 15.9 16.3 18.7 20.0 21.7 999.9 13.7 17.0 17.87 1991 22.6 21.7 21.5 20.9 17.6 16.3 999.9 14.9 15.5 17.2 17.6 21.0 21.4 20.0 15.4 16.8 18.41 1992 23.7 22.6 20.9 20.4 17.0 16.2 999.9 14.3 14.3 16.7 999.9 999.9 22.4 19.4 15.1 16.4 18.34