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 1926 20.4 21.5 20.5 19.6 14.2 13.9 14.1 12.7 15.8 17.9 19.3 19.6 20.5 18.1 13.6 17.7 17.45 1927 21.3 20.0 20.1 17.6 15.4 999.9 999.9 999.9 999.9 999.9 999.9 999.9 20.3 17.7 999.9 999.9 999.90 1928 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 1929 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 17.7 18.2 999.9 999.9 999.9 999.9 999.90 1930 21.3 21.4 20.8 17.7 15.9 14.3 13.0 13.6 15.8 16.8 18.8 20.5 20.3 18.1 13.6 17.1 17.30 1931 20.3 19.9 19.4 18.0 14.3 11.7 12.0 13.4 14.1 16.9 16.8 19.1 20.2 17.2 12.4 15.9 16.44 1932 22.5 19.9 20.5 18.0 17.6 13.2 13.0 12.4 13.4 16.1 18.7 19.3 20.5 18.7 12.9 16.1 17.03 1933 20.5 22.8 20.4 18.4 15.7 14.5 12.0 12.2 14.0 17.7 16.5 18.5 20.9 18.2 12.9 16.1 17.00 1934 23.1 22.4 22.2 17.1 16.5 13.4 12.2 12.7 15.7 16.2 18.1 20.3 21.3 18.6 12.8 16.7 17.34 1935 20.0 21.1 20.0 18.4 15.8 12.7 12.0 12.9 14.4 15.5 18.7 18.6 20.5 18.1 12.5 16.2 16.82 1936 21.9 20.9 19.9 18.5 15.2 12.5 12.3 14.2 15.3 16.1 18.7 19.2 20.5 17.9 13.0 16.7 17.01 1937 21.0 22.3 20.9 18.3 16.1 12.9 12.1 13.1 15.4 17.9 18.4 19.9 20.8 18.4 12.7 17.2 17.30 1938 21.0 21.5 21.3 19.1 16.1 12.6 12.4 13.3 15.6 17.7 20.4 20.5 20.8 18.8 12.8 17.9 17.58 1939 21.9 22.6 20.0 18.2 17.7 14.0 12.2 13.5 14.4 17.0 17.3 18.6 21.7 18.6 13.2 16.2 17.44 1940 20.8 20.5 23.6 17.3 15.2 13.3 12.7 14.2 14.7 17.4 17.0 19.9 20.0 18.7 13.4 16.4 17.11 1941 19.4 20.6 19.7 20.0 14.9 14.2 13.1 14.2 14.8 14.8 19.8 20.0 20.0 18.2 13.8 16.5 17.12 1942 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 1943 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 1944 20.8 21.6 20.2 17.8 14.3 13.3 12.9 999.9 16.3 999.9 999.9 999.9 20.7 17.4 13.2 999.9 16.99 1945 20.7 20.7 20.5 19.3 16.1 15.0 11.9 13.6 14.6 15.3 17.7 20.0 20.2 18.6 13.5 15.9 17.05 1946 20.7 19.5 19.5 16.7 16.4 12.3 13.8 999.9 999.9 999.9 999.9 999.9 20.1 17.5 13.2 999.9 16.79 1947 999.9 20.8 19.9 19.1 16.9 15.2 12.4 12.9 15.3 16.6 16.9 19.3 999.9 18.6 13.5 16.3 17.29 1948 20.1 19.8 19.3 17.8 999.9 13.1 12.7 14.1 15.4 15.7 16.1 18.9 19.7 17.4 13.3 15.7 16.53 1949 19.7 18.5 19.1 17.7 999.9 999.9 13.4 14.1 14.4 15.3 17.0 20.2 19.0 17.2 13.9 15.6 16.43 1950 20.4 999.9 19.2 19.5 17.8 13.0 11.8 13.6 15.8 15.7 999.9 20.3 20.6 18.8 12.8 16.6 17.21 1951 21.1 21.4 20.7 17.6 14.7 13.6 11.7 10.7 14.6 16.4 19.8 20.0 20.9 17.7 12.0 16.9 16.88 1952 20.6 20.3 999.9 16.7 14.9 14.2 11.4 12.4 14.9 15.4 16.6 18.2 20.3 16.9 12.7 15.6 16.37 1953 19.3 999.9 21.6 19.3 16.3 13.8 13.3 999.9 999.9 15.7 17.3 18.6 19.1 19.1 13.7 15.6 16.85 1954 19.7 19.0 20.8 16.5 14.4 12.9 13.1 999.9 14.4 999.9 999.9 999.9 19.1 17.2 13.1 999.9 16.35 1955 999.9 21.9 19.6 18.0 999.9 999.9 999.9 999.9 14.8 999.9 999.9 18.2 999.9 17.6 999.9 999.9 999.90 1956 19.5 20.5 999.9 999.9 15.6 11.3 999.9 999.9 12.9 14.6 16.9 17.5 19.4 999.9 999.9 14.8 999.90 1957 19.6 20.0 19.3 999.9 15.3 16.0 999.9 999.9 999.9 999.9 18.7 18.1 19.0 17.4 999.9 999.9 999.90 1958 999.9 20.2 19.8 18.6 16.2 12.2 11.7 11.4 12.2 14.9 17.2 17.9 19.3 18.2 11.8 14.8 16.02 1959 19.1 19.5 19.6 999.9 16.1 14.2 11.7 13.9 13.9 16.9 999.9 16.8 18.8 18.0 13.3 16.2 16.57 1960 999.9 19.2 20.1 16.3 13.7 11.6 11.6 999.9 999.9 999.9 16.8 19.4 18.2 16.7 11.7 999.9 15.40 1961 22.2 21.7 21.4 19.3 999.9 14.6 12.4 13.2 16.1 16.7 17.5 20.1 21.1 19.2 13.4 16.8 17.60 1962 21.2 20.7 19.8 19.2 14.8 999.9 999.9 13.5 14.5 999.9 999.9 999.9 20.7 17.9 999.9 999.9 999.90 1963 999.9 999.9 19.8 17.6 16.4 13.6 12.2 13.3 15.9 18.4 999.9 999.9 999.9 17.9 13.0 18.0 17.47 1964 22.0 19.3 20.9 999.9 999.9 999.9 999.9 999.9 999.9 16.2 18.2 19.5 20.2 999.9 999.9 16.3 999.90 1965 21.0 999.9 22.4 18.5 16.0 999.9 12.6 13.1 999.9 17.7 999.9 22.3 20.6 19.0 13.0 999.9 17.38 1966 999.9 21.7 999.9 18.9 999.9 999.9 999.9 12.7 999.9 16.0 999.9 999.9 22.2 999.9 999.9 999.9 999.90 1967 21.3 999.9 999.9 999.9 999.9 999.9 11.9 12.2 15.3 18.6 999.9 999.9 999.9 999.9 12.2 17.8 999.90 1968 999.9 999.9 20.9 18.8 13.9 999.9 999.9 11.5 14.2 18.6 999.9 19.6 999.9 17.9 999.9 17.2 999.90 1969 23.2 21.5 20.0 19.6 16.1 14.1 13.1 14.9 14.2 17.9 18.9 19.7 21.4 18.6 14.0 17.0 17.76 1970 20.2 24.0 20.8 18.0 15.0 14.6 12.4 999.9 999.9 999.9 20.1 20.2 21.3 17.9 13.6 999.9 17.48 1971 21.5 21.6 22.1 19.4 15.1 999.9 12.9 12.2 15.8 17.2 18.1 18.6 21.1 18.9 12.7 17.0 17.43 1972 19.2 22.1 20.7 19.0 17.2 999.9 12.7 999.9 16.8 17.8 18.7 23.4 20.0 19.0 999.9 17.8 17.54 1973 22.8 21.9 20.9 19.8 17.4 12.2 13.2 12.5 15.3 17.3 18.9 21.3 22.7 19.4 12.6 17.2 17.97 1974 999.9 21.4 20.9 17.4 15.2 12.8 12.7 13.7 14.9 17.7 999.9 999.9 21.5 17.8 13.1 17.1 17.39 1975 999.9 999.9 999.9 20.4 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1976 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 15.3 18.1 999.9 999.9 999.9 999.9 15.8 999.90 1977 19.5 21.7 20.2 15.9 999.9 13.4 12.8 14.3 14.7 17.8 18.9 21.3 20.1 16.9 13.5 17.1 16.90 1978 20.3 22.0 20.5 19.0 16.0 13.3 12.5 13.0 13.7 17.2 18.5 19.6 21.2 18.5 12.9 16.5 17.28 1979 23.1 21.5 21.9 18.0 13.8 13.3 12.5 12.5 14.5 17.5 21.5 21.1 21.4 17.9 12.8 17.8 17.48 1980 21.9 21.8 21.3 19.8 16.7 13.2 12.5 13.8 16.8 17.3 20.9 22.0 21.6 19.3 13.2 18.3 18.09 1981 22.4 20.9 19.2 21.7 15.9 12.1 11.6 12.3 15.8 17.3 16.7 18.9 21.8 18.9 12.0 16.6 17.33 1982 999.9 21.2 18.4 16.9 15.6 12.3 11.8 15.5 15.1 18.0 21.3 20.4 20.2 17.0 13.2 18.1 17.13 1983 21.4 23.7 17.8 999.9 18.1 15.1 999.9 14.9 16.9 17.4 18.2 20.6 21.8 18.1 14.7 17.5 18.03 1984 20.4 22.2 19.7 18.5 16.6 13.6 12.0 13.0 999.9 18.5 19.5 999.9 21.1 18.3 12.9 18.1 17.58 1985 23.7 21.6 20.4 19.1 14.9 14.2 13.6 12.9 15.4 16.7 18.3 19.6 22.2 18.1 13.6 16.8 17.67 1986 21.4 21.2 22.3 17.8 999.9 999.9 11.7 12.3 999.9 999.9 999.9 999.9 20.7 18.9 12.2 999.9 17.12 1987 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 17.7 999.9 999.9 999.9 999.9 999.9 999.9 999.90 1988 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 1989 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 1990 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 18.6 20.9 999.9 999.9 999.9 999.9 999.90 1991 22.9 23.1 20.8 19.0 16.4 14.5 13.3 13.3 15.5 18.3 19.8 18.8 22.3 18.7 13.7 17.9 18.15 1992 19.8 21.6 21.3 999.9 16.0 14.1 13.3 13.1 14.0 999.9 999.9 999.9 20.1 18.8 13.5 999.9 17.31 1993 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 1994 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 1995 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 1996 999.9 999.9 999.9 999.9 15.4 13.6 12.8 13.2 14.8 17.2 17.9 19.3 999.9 999.9 13.2 16.6 999.90 1997 20.5 23.4 19.0 18.9 15.1 13.0 11.3 12.3 15.0 16.7 18.7 19.5 21.1 17.7 12.2 16.8 16.93 1998 20.1 21.1 20.4 17.2 17.2 12.9 10.9 13.6 15.4 15.8 17.9 19.7 20.2 18.3 12.5 16.4 16.83 1999 20.7 20.4 19.3 16.7 16.7 13.1 13.0 14.2 15.4 16.8 16.7 18.8 20.3 17.6 13.4 16.3 16.89 2000 20.6 21.3 20.1 17.7 14.4 12.4 12.7 12.0 15.3 15.6 18.5 20.1 20.2 17.4 12.4 16.5 16.62 2001 21.8 21.4 19.3 18.0 15.1 12.4 12.2 13.4 15.7 14.3 17.0 17.5 21.1 17.5 12.7 15.7 16.73 2002 19.1 999.9 19.4 19.1 17.0 13.3 13.1 13.0 14.5 16.8 18.4 18.7 18.6 18.5 13.1 16.6 16.70 2003 20.7 20.4 18.6 18.0 15.5 13.0 12.5 12.6 14.3 14.9 18.4 19.5 19.9 17.4 12.7 15.9 16.47 2004 19.4 20.9 19.1 17.6 14.8 14.1 11.5 12.6 14.5 17.7 18.6 19.6 19.9 17.2 12.7 16.9 16.69 2005 19.9 21.1 20.4 19.1 17.0 13.6 11.9 13.1 14.7 16.1 18.0 20.3 20.2 18.8 12.9 16.3 17.04 2006 20.3 19.1 19.8 17.2 14.1 11.5 999.9 14.7 15.8 17.4 18.8 19.3 19.9 17.0 12.8 17.3 16.77 2007 21.5 22.3 19.7 18.7 15.0 11.9 13.4 13.9 999.9 16.2 999.9 19.8 21.0 17.8 13.1 999.9 17.17 2008 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 18.7 20.1 999.9 999.9 999.9 999.9 999.90 2009 22.4 22.6 20.6 18.4 15.2 13.5 13.0 15.1 15.3 17.7 21.6 999.9 21.7 18.1 13.9 18.2 17.96