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 1904 20.5 19.8 20.7 17.6 14.6 14.4 12.4 13.6 13.9 14.0 16.7 18.5 19.6 17.6 13.5 14.9 16.38 1905 18.7 18.8 17.5 17.7 15.4 13.8 13.0 11.9 12.8 14.1 16.5 19.4 18.7 16.9 12.9 14.5 15.73 1906 19.8 19.5 19.5 18.1 16.1 14.3 12.3 12.7 12.3 15.1 16.3 19.5 19.6 17.9 13.1 14.6 16.28 1907 20.0 20.6 19.5 17.1 16.4 14.3 13.8 14.2 13.8 14.1 15.0 16.6 20.0 17.7 14.1 14.3 16.53 1908 18.4 18.8 17.3 16.9 14.9 12.4 12.4 12.4 13.1 14.5 16.5 18.3 17.9 16.4 12.4 14.7 15.35 1909 19.9 20.7 19.1 16.4 15.6 14.2 12.9 12.3 14.1 14.6 15.2 20.5 19.6 17.0 13.1 14.6 16.11 1910 20.1 21.1 20.5 19.3 15.1 13.4 12.2 13.5 13.4 13.1 16.0 17.4 20.6 18.3 13.0 14.2 16.52 1911 20.6 20.2 18.9 17.3 14.4 13.8 12.7 12.3 13.4 14.8 17.0 16.9 19.4 16.9 12.9 15.1 16.07 1912 19.9 20.9 19.0 18.0 15.6 14.6 12.8 13.5 13.3 14.4 16.3 18.8 19.2 17.5 13.6 14.7 16.27 1913 19.3 20.4 19.0 17.0 16.1 14.8 13.6 12.8 13.9 13.9 16.6 17.5 19.5 17.4 13.7 14.8 16.35 1914 19.5 19.0 18.4 16.3 14.6 14.4 12.6 14.2 14.3 16.9 17.2 18.6 18.7 16.4 13.7 16.1 16.24 1915 21.5 20.7 18.8 18.5 16.3 15.1 13.4 13.5 12.9 14.6 17.5 19.4 20.3 17.9 14.0 15.0 16.78 1916 19.1 19.5 18.4 16.9 16.1 13.5 12.9 12.9 14.6 14.0 17.1 18.3 19.3 17.1 13.1 15.2 16.20 1917 20.1 20.0 18.3 16.9 14.8 13.8 13.1 12.1 12.9 13.7 15.9 17.9 19.5 16.7 13.0 14.2 15.83 1918 21.7 19.7 18.5 18.9 15.8 14.9 13.1 13.0 14.8 14.3 17.8 18.1 19.8 17.7 13.7 15.6 16.70 1919 18.8 18.6 20.4 18.1 15.7 13.9 14.4 12.9 13.5 13.8 16.3 17.5 18.5 18.1 13.7 14.5 16.21 1920 22.1 19.6 19.5 18.3 15.8 14.0 12.6 11.9 13.9 15.6 17.9 18.6 19.7 17.9 12.8 15.8 16.56 1921 20.4 23.2 20.5 18.4 15.9 15.5 14.5 13.3 13.8 14.8 15.6 19.4 20.7 18.3 14.4 14.7 17.04 1922 19.0 20.0 20.0 17.5 15.0 13.5 12.3 13.7 12.9 14.8 16.9 16.6 19.5 17.5 13.2 14.9 16.25 1923 18.5 20.8 19.5 18.5 16.2 13.3 13.6 13.1 13.1 13.9 16.0 17.6 18.6 18.1 13.3 14.3 16.09 1924 19.4 19.6 18.2 18.5 16.4 14.5 14.1 12.3 13.6 13.6 16.4 18.8 18.9 17.7 13.6 14.5 16.18 1925 19.5 19.6 19.4 17.2 15.6 14.3 13.0 12.7 14.2 14.6 17.8 20.0 19.3 17.4 13.3 15.5 16.39 1926 21.0 19.3 18.9 17.4 15.1 14.0 12.5 12.3 14.0 14.7 17.1 18.1 20.1 17.1 12.9 15.3 16.36 1927 18.7 19.0 17.5 19.4 15.4 13.6 12.7 13.1 14.0 15.4 17.4 20.7 18.6 17.4 13.1 15.6 16.19 1928 19.7 19.5 19.1 18.1 15.7 14.6 13.5 14.1 13.4 14.0 16.4 18.1 20.0 17.6 14.1 14.6 16.57 1929 18.9 20.6 18.5 16.9 14.8 13.0 12.4 12.6 13.1 14.6 16.6 18.9 19.2 16.7 12.7 14.8 15.84 1930 19.5 19.4 21.6 18.7 16.7 15.1 13.8 13.5 13.6 14.4 16.2 18.9 19.3 19.0 14.1 14.7 16.78 1931 20.7 18.9 20.3 17.8 14.4 12.9 13.8 13.7 13.8 14.9 17.6 22.2 19.5 17.5 13.5 15.4 16.48 1932 21.6 22.2 19.0 18.3 16.4 15.2 13.6 12.4 14.1 15.1 16.8 18.1 22.0 17.9 13.7 15.3 17.24 1933 20.5 22.5 18.6 18.5 15.9 15.3 13.0 12.3 14.1 15.0 17.3 19.1 20.4 17.7 13.5 15.5 16.76 1934 20.8 22.7 20.6 17.9 17.1 14.4 13.0 13.4 14.0 13.9 15.7 18.1 20.9 18.5 13.6 14.5 16.88 1935 20.6 19.8 18.7 17.9 16.2 13.8 12.9 12.9 13.4 13.6 15.6 17.7 19.5 17.6 13.2 14.2 16.12 1936 19.8 19.9 20.1 17.5 14.8 13.3 12.9 14.1 15.0 15.4 19.1 20.0 19.1 17.5 13.4 16.5 16.63 1937 19.9 20.8 19.7 19.7 16.2 14.3 13.6 13.3 13.6 15.6 17.6 17.4 20.2 18.5 13.7 15.6 17.03 1938 19.3 19.5 19.1 17.1 15.6 13.8 13.5 13.3 14.4 15.0 17.1 18.5 18.7 17.3 13.5 15.5 16.26 1939 19.3 20.3 19.4 18.3 16.1 14.3 13.0 13.0 14.1 14.9 17.5 19.1 19.4 17.9 13.4 15.5 16.56 1940 21.2 21.9 20.4 17.0 15.9 15.1 13.7 13.3 13.8 14.8 17.5 18.1 20.7 17.8 14.0 15.4 16.98 1941 20.2 20.4 18.1 16.6 15.5 15.1 13.9 13.7 12.7 14.4 16.7 19.8 19.6 16.7 14.2 14.6 16.28 1942 19.6 19.6 18.6 17.1 15.7 14.0 12.9 12.9 13.2 13.7 17.3 19.7 19.7 17.1 13.3 14.7 16.20 1943 18.6 19.0 19.0 16.3 14.8 14.6 12.2 12.4 13.3 13.9 17.0 18.1 19.1 16.7 13.1 14.7 15.90 1944 19.7 19.1 18.3 17.1 14.5 15.3 13.4 13.0 13.7 16.1 17.3 17.5 19.0 16.6 13.9 15.7 16.30 1945 19.1 20.8 19.3 18.9 16.5 14.3 12.8 13.0 12.9 14.8 17.3 17.6 19.1 18.2 13.4 15.0 16.43 1946 18.3 19.5 18.4 18.0 16.4 13.9 13.5 13.0 14.2 15.4 16.6 17.6 18.5 17.6 13.5 15.4 16.23 1947 19.0 20.0 19.6 17.3 15.2 14.4 13.4 12.6 13.4 14.2 15.5 17.5 18.9 17.4 13.5 14.4 16.02 1948 19.7 20.6 21.4 16.9 16.5 15.3 13.8 14.4 14.0 15.8 15.8 17.3 19.3 18.3 14.5 15.2 16.81 1949 21.0 21.1 19.7 18.8 15.6 15.3 14.7 14.0 14.0 14.3 17.1 19.0 19.8 18.0 14.7 15.1 16.91 1950 20.5 21.1 20.1 19.0 15.6 15.0 13.9 13.2 13.4 13.8 15.5 16.6 20.2 18.2 14.0 14.2 16.68 1951 18.5 20.0 19.0 16.7 14.3 13.3 12.6 11.2 13.9 14.9 16.1 17.6 18.4 16.7 12.4 15.0 15.59 1952 19.3 20.6 19.7 17.8 15.4 15.0 12.5 13.1 12.9 13.8 15.2 16.9 19.2 17.6 13.5 14.0 16.08 1953 19.4 19.1 19.7 17.9 15.8 13.5 13.4 12.3 13.9 14.0 15.5 15.7 18.5 17.8 13.1 14.5 15.95 1954 20.6 20.7 19.0 16.2 14.9 14.0 13.4 13.0 14.2 15.4 15.3 17.9 19.0 16.7 13.5 15.0 16.03 1955 20.1 21.8 20.2 16.7 14.7 12.7 12.9 12.4 12.9 13.5 15.6 17.9 19.9 17.2 12.7 14.0 15.95 1956 21.8 20.5 19.8 16.3 14.1 12.6 12.2 12.0 13.4 13.8 17.0 17.6 20.1 16.7 12.3 14.7 15.95 1957 20.1 20.4 18.6 16.9 15.6 14.4 12.1 13.4 13.1 14.9 17.0 18.3 19.4 17.0 13.3 15.0 16.18 1958 20.9 20.3 19.9 17.4 16.2 14.6 12.7 12.7 13.0 14.1 17.6 19.8 19.8 17.8 13.3 14.9 16.48 1959 19.9 21.0 20.2 17.3 16.3 15.4 14.3 14.6 13.6 15.3 15.9 16.9 20.2 17.9 14.8 14.9 16.97 1960 18.0 19.1 17.1 15.4 14.5 13.5 11.9 12.3 13.0 14.9 16.0 18.8 18.0 15.7 12.6 14.6 15.22 1961 21.0 22.6 20.9 16.1 17.2 14.6 12.8 12.7 14.1 14.6 17.0 18.6 20.8 18.1 13.4 15.2 16.87 1962 22.8 21.2 18.3 18.9 17.2 15.2 13.6 13.7 13.6 13.5 16.9 19.1 20.9 18.1 14.2 14.7 16.96 1963 20.3 20.6 20.6 17.8 15.8 13.6 12.7 13.3 14.0 15.7 17.1 19.8 20.0 18.1 13.2 15.6 16.72 1964 19.6 20.0 19.5 16.5 15.5 14.9 13.2 12.7 13.2 13.0 15.6 18.0 19.8 17.2 13.6 13.9 16.12 1965 21.3 19.9 19.6 999.9 15.3 999.9 12.9 12.9 13.8 15.1 16.2 20.3 19.7 17.5 13.3 15.0 16.38 1966 21.1 20.4 19.6 17.0 15.8 13.3 13.1 12.7 13.2 14.3 17.4 19.0 20.6 17.5 13.0 15.0 16.52 1967 20.5 22.2 19.5 18.3 16.1 15.4 13.5 12.8 14.6 16.5 17.2 19.2 20.6 18.0 13.9 16.1 17.13 1968 19.9 20.1 18.1 16.1 14.1 13.7 13.2 12.4 12.8 14.4 15.8 999.9 19.7 16.1 13.1 14.3 15.82 1969 19.5 19.9 19.8 17.0 15.5 14.9 13.7 13.1 12.4 16.8 17.0 19.1 19.1 17.4 13.9 15.4 16.46 1970 19.9 22.1 20.1 16.9 15.8 14.1 14.2 13.2 13.6 14.4 15.9 999.9 20.4 17.6 13.8 14.6 16.61 1971 20.5 20.7 20.0 17.1 15.4 14.8 13.9 12.6 13.1 14.2 14.9 17.6 20.0 17.5 13.8 14.1 16.34 1972 20.7 23.1 999.9 17.6 17.4 14.5 13.3 13.1 14.1 14.9 18.2 21.4 20.5 18.4 13.6 15.7 17.07 1973 21.4 20.4 19.5 17.5 16.1 12.8 13.7 12.8 13.2 14.9 17.6 18.4 21.1 17.7 13.1 15.2 16.78 1974 21.4 20.1 20.5 17.2 15.8 14.8 13.5 13.5 14.6 14.8 16.5 18.6 20.0 17.8 13.9 15.3 16.76 1975 19.8 24.0 19.3 17.1 16.5 14.9 14.0 13.2 13.5 15.5 16.6 19.6 20.8 17.6 14.0 15.2 16.92 1976 20.5 22.6 20.6 18.6 17.0 14.7 14.4 13.9 14.6 16.1 15.8 18.8 20.9 18.7 14.3 15.5 17.37 1977 999.9 21.4 18.5 18.3 15.2 14.8 14.6 14.1 13.6 15.7 17.8 21.1 20.3 17.3 14.5 15.7 16.96 1978 22.5 21.5 22.6 19.4 16.6 14.2 13.3 13.9 13.5 15.6 18.6 20.8 21.7 19.5 13.8 15.9 17.73 1979 20.2 20.8 20.4 17.6 14.8 15.1 13.7 12.8 13.8 15.7 17.7 20.1 20.6 17.6 13.9 15.7 16.95 1980 21.6 20.4 20.3 17.2 16.7 999.9 13.3 14.1 14.2 13.3 16.9 18.0 20.7 18.1 14.1 14.8 16.91 1981 21.0 19.0 19.5 18.5 15.6 12.9 13.6 12.9 14.4 15.5 16.3 17.6 19.3 17.9 13.1 15.4 16.43 1982 18.9 20.5 18.8 17.5 16.0 14.0 13.4 13.6 14.1 15.6 19.0 19.3 19.0 17.4 13.7 16.2 16.58 1983 21.5 20.4 21.8 18.6 17.5 15.6 13.7 14.6 15.2 15.4 16.8 19.3 20.4 19.3 14.6 15.8 17.53 1984 20.9 21.3 19.5 18.5 16.2 15.2 13.0 13.2 13.9 16.5 17.2 17.7 20.5 18.1 13.8 15.9 17.06 1985 19.5 23.9 21.0 17.6 15.9 16.3 999.9 13.4 14.4 14.9 17.8 17.8 20.4 18.2 14.7 15.7 17.23 1986 21.8 19.8 18.4 17.0 16.0 13.8 12.8 12.8 14.3 14.4 16.9 18.1 19.8 17.1 13.1 15.2 16.32 1987 18.8 19.4 20.6 18.0 15.5 15.3 13.5 13.7 14.8 15.2 17.1 19.0 18.8 18.0 14.2 15.7 16.67 1988 19.5 23.1 21.9 19.5 17.0 14.7 13.8 13.8 14.9 15.7 16.8 19.1 20.5 19.5 14.1 15.8 17.48 1989 21.7 21.1 20.7 18.2 16.6 14.6 13.4 14.3 14.8 14.8 18.6 18.5 20.6 18.5 14.1 16.1 17.33 1990 19.1 22.3 20.5 18.1 16.0 13.4 12.6 12.6 14.2 14.8 17.0 18.6 20.0 18.2 12.9 15.3 16.59 1991 20.9 20.2 20.3 19.0 16.6 15.1 14.1 13.6 14.4 16.2 16.1 19.4 19.9 18.6 14.3 15.6 17.09 1992 22.2 21.5 19.8 18.7 15.6 14.3 14.9 12.9 12.8 15.4 16.5 18.6 21.0 18.0 14.0 14.9 17.00 1993 20.2 19.8 19.1 17.2 15.5 14.0 13.3 13.3 14.1 14.7 17.2 18.8 19.5 17.3 13.5 15.3 16.42 1994 19.9 20.3 21.3 19.5 17.3 14.8 14.2 14.2 14.8 15.5 18.2 20.4 19.7 19.4 14.4 16.2 17.40 1995 21.2 22.3 21.4 18.5 16.1 14.1 13.8 14.7 14.9 16.4 17.4 19.2 21.3 18.7 14.2 16.2 17.60 1996 20.1 23.1 19.8 19.0 16.7 15.0 11.7 13.9 14.5 15.3 18.0 18.0 20.8 18.5 13.5 15.9 17.19 1997 21.8 21.3 19.6 19.2 16.1 15.2 13.5 13.1 14.7 16.5 17.7 20.0 20.4 18.3 13.9 16.3 17.23 1998 21.0 20.3 20.7 17.8 16.7 14.2 12.8 14.5 14.1 15.3 17.3 19.8 20.4 18.4 13.8 15.6 17.06 1999 20.8 22.0 21.0 20.5 17.5 15.1 14.6 13.8 14.3 14.9 18.3 21.7 20.9 19.7 14.5 15.8 17.72 2000 22.4 22.2 20.5 19.1 16.4 15.1 13.8 13.2 14.9 15.2 18.8 19.6 22.1 18.7 14.0 16.3 17.78 2001 20.7 20.7 20.1 18.8 16.5 15.5 14.0 13.8 14.5 14.4 18.2 17.6 20.3 18.5 14.4 15.7 17.23 2002 20.4 21.7 20.3 18.4 16.8 15.0 14.1 13.5 14.3 15.8 999.9 999.9 19.9 18.5 14.2 15.9 17.12