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 19.6 19.1 18.8 17.9 15.9 14.7 14.6 13.8 14.9 15.0 16.9 18.3 18.9 17.5 14.4 15.6 16.60 1898 20.2 20.4 19.7 18.1 16.9 13.5 14.3 14.6 15.7 15.2 16.9 19.4 19.6 18.2 14.1 15.9 16.98 1899 19.8 20.4 19.6 17.2 16.2 14.2 13.9 14.0 14.0 15.7 16.9 19.2 19.9 17.7 14.0 15.5 16.77 1900 19.0 19.8 17.7 17.4 15.9 14.9 13.7 13.2 13.9 15.9 17.4 19.1 19.3 17.0 13.9 15.7 16.50 1901 20.4 20.4 18.7 18.3 15.9 14.0 13.7 14.0 14.6 15.9 17.5 18.0 20.0 17.6 13.9 16.0 16.88 1902 18.8 19.4 20.3 19.0 16.8 14.5 13.5 14.7 14.6 15.3 17.1 18.1 18.7 18.7 14.2 15.7 16.83 1903 19.8 20.4 18.7 16.1 16.2 14.9 13.1 13.6 13.8 14.4 17.2 18.6 19.4 17.0 13.9 15.1 16.36 1904 20.0 20.0 20.9 19.0 15.7 14.5 13.6 14.5 14.9 15.1 17.2 19.0 19.5 18.5 14.2 15.7 17.00 1905 19.7 19.4 18.8 18.7 15.9 14.3 14.0 13.0 13.5 15.0 17.3 19.8 19.4 17.8 13.8 15.3 16.55 1906 21.0 20.2 19.8 19.0 16.8 15.0 13.1 13.4 13.3 15.7 17.6 19.8 20.3 18.5 13.8 15.5 17.06 1907 20.5 20.9 20.2 18.3 17.0 15.0 14.1 14.7 14.1 15.1 16.7 18.4 20.4 18.5 14.6 15.3 17.20 1908 19.4 19.4 18.8 18.3 16.1 13.3 13.6 13.1 14.4 15.7 17.7 19.2 19.1 17.7 13.3 15.9 16.52 1909 20.5 21.4 19.9 17.9 16.5 14.7 13.7 13.5 15.3 15.4 17.0 21.5 20.4 18.1 14.0 15.9 17.08 1910 21.1 21.5 20.9 20.4 15.9 14.1 12.8 14.1 14.5 14.7 16.8 18.4 21.4 19.1 13.7 15.3 17.36 1911 21.2 20.8 19.4 18.3 15.4 14.7 13.4 13.4 14.4 15.7 17.9 18.4 20.1 17.7 13.8 16.0 16.92 1912 20.5 20.9 19.4 19.0 16.7 14.9 13.6 14.5 13.8 15.3 17.2 18.9 19.9 18.4 14.3 15.4 17.02 1913 19.7 20.6 19.4 17.9 16.9 15.6 14.2 13.7 15.2 15.1 17.4 18.3 19.7 18.1 14.5 15.9 17.05 1914 19.8 19.8 19.1 17.6 15.5 15.2 13.7 15.2 15.6 17.6 17.9 19.9 19.3 17.4 14.7 17.0 17.11 1915 20.4 21.0 19.7 19.4 17.5 15.6 14.7 14.1 13.6 15.0 17.6 19.5 20.4 18.9 14.8 15.4 17.38 1916 19.7 20.2 19.8 18.8 16.8 14.3 13.3 13.3 15.1 14.9 17.8 19.2 19.8 18.5 13.6 15.9 16.96 1917 19.4 20.1 18.4 17.4 15.4 13.9 13.3 12.4 13.1 14.1 16.7 18.2 19.6 17.1 13.2 14.6 16.12 1918 20.8 19.7 19.1 19.4 16.3 15.1 13.9 13.6 15.0 14.9 18.2 18.6 19.6 18.3 14.2 16.0 17.02 1919 19.3 19.3 19.7 18.6 16.3 14.6 14.5 13.7 13.6 14.2 16.6 17.6 19.1 18.2 14.3 14.8 16.58 1920 21.2 20.1 20.2 18.7 16.1 14.3 12.9 12.6 14.7 15.9 18.2 19.3 19.6 18.3 13.3 16.3 16.88 1921 19.8 22.2 20.8 18.8 16.5 15.9 14.9 14.3 14.3 15.2 16.2 18.4 20.4 18.7 15.0 15.2 17.35 1922 19.5 19.6 20.3 18.1 15.6 14.4 12.9 13.9 13.8 15.3 17.3 17.2 19.2 18.0 13.7 15.5 16.59 1923 19.1 21.1 19.7 18.9 16.6 13.6 14.0 13.8 13.5 14.6 16.4 18.1 19.1 18.4 13.8 14.8 16.54 1924 19.2 19.5 18.7 18.7 16.5 14.8 14.6 13.4 14.5 14.4 16.7 19.1 18.9 18.0 14.3 15.2 16.59 1925 19.3 19.6 19.6 17.8 16.1 14.8 13.4 13.2 14.7 14.8 18.2 19.8 19.3 17.8 13.8 15.9 16.72 1926 21.1 20.0 19.4 18.7 15.8 14.4 13.3 12.8 14.4 14.9 17.2 18.4 20.3 18.0 13.5 15.5 16.82 1927 18.6 19.4 18.0 20.0 16.1 13.8 13.2 13.7 14.6 15.5 17.9 19.6 18.8 18.0 13.6 16.0 16.60 1928 19.6 19.6 19.5 18.4 16.4 15.0 14.0 13.9 13.8 14.4 16.6 18.5 19.6 18.1 14.3 14.9 16.73 1929 18.8 19.8 18.4 17.2 15.2 13.5 12.7 12.8 13.8 15.0 17.1 18.5 19.0 16.9 13.0 15.3 16.07 1930 19.9 19.4 20.2 18.6 17.0 15.4 14.0 13.9 14.1 15.1 16.5 18.5 19.3 18.6 14.4 15.2 16.88 1931 20.1 19.1 19.6 17.6 14.4 12.9 13.3 13.6 13.8 15.2 17.0 20.6 19.2 17.2 13.3 15.3 16.26 1932 21.0 21.5 19.2 18.3 16.5 14.9 13.5 12.7 14.6 15.5 17.0 18.1 21.0 18.0 13.7 15.7 17.11 1933 20.1 21.8 19.7 19.2 16.8 15.3 13.6 13.4 15.2 15.5 17.5 19.2 20.0 18.6 14.1 16.1 17.18 1934 20.6 21.5 20.7 18.9 17.6 14.8 14.0 14.2 14.5 14.7 16.3 18.2 20.4 19.1 14.3 15.2 17.25 1935 19.8 19.9 19.0 18.6 17.0 14.1 13.5 13.6 13.8 14.4 16.1 18.0 19.3 18.2 13.7 14.8 16.50 1936 19.9 19.7 19.6 18.4 15.3 13.8 13.3 13.8 15.2 15.1 17.9 19.4 19.2 17.8 13.6 16.1 16.67 1937 19.5 20.5 19.7 20.0 16.6 14.7 14.1 13.2 13.9 15.8 17.1 17.9 19.8 18.8 14.0 15.6 17.04 1938 19.0 18.9 18.7 17.3 16.2 14.3 13.7 13.8 14.4 15.0 17.0 18.8 18.6 17.4 13.9 15.5 16.35 1939 19.3 19.6 19.3 18.6 16.5 14.7 13.8 13.3 14.8 15.6 17.1 18.7 19.2 18.1 13.9 15.8 16.78 1940 19.4 20.1 19.7 17.2 15.7 15.4 14.0 14.2 14.6 15.4 16.9 17.9 19.4 17.5 14.5 15.6 16.77 1941 19.7 19.9 18.4 17.0 16.3 15.0 14.2 14.3 13.2 15.0 17.0 19.3 19.2 17.2 14.5 15.1 16.49 1942 18.7 19.5 18.6 18.0 16.3 14.3 13.8 13.6 13.6 14.3 17.4 19.1 19.2 17.6 13.9 15.1 16.45 1943 18.8 19.2 19.0 17.0 15.8 15.1 12.9 13.3 14.1 14.4 16.7 18.2 19.0 17.3 13.8 15.1 16.28 1944 19.6 19.4 18.6 17.5 15.3 15.3 13.7 14.2 14.5 17.0 18.2 18.1 19.1 17.1 14.4 16.6 16.79 1945 19.1 20.0 19.5 19.5 17.1 14.8 13.6 13.5 13.7 15.6 17.4 18.3 19.1 18.7 14.0 15.6 16.82 1946 19.0 18.3 18.3 18.4 16.1 14.3 13.0 13.1 14.3 15.5 16.3 18.1 18.5 17.6 13.5 15.4 16.24 1947 19.2 19.1 18.9 18.2 15.9 15.3 14.2 13.8 14.1 15.2 16.3 18.1 18.8 17.7 14.4 15.2 16.52 1948 19.8 20.5 21.1 17.8 17.3 15.9 13.9 14.6 14.3 15.5 15.8 17.5 19.5 18.7 14.8 15.2 17.05 1949 19.9 20.7 20.2 19.4 16.8 15.6 14.7 14.4 14.8 14.8 17.2 19.6 19.4 18.8 14.9 15.6 17.17 1950 20.6 20.6 20.3 19.9 16.6 15.3 14.4 13.9 14.0 14.8 16.3 17.9 20.3 18.9 14.5 15.0 17.19 1951 19.3 19.7 19.6 17.7 15.7 14.2 13.6 12.2 14.9 15.3 16.8 18.0 19.0 17.7 13.3 15.7 16.41 1952 19.6 20.2 20.3 18.2 16.2 15.4 13.2 13.9 14.1 14.7 16.0 17.3 19.3 18.2 14.2 14.9 16.65 1953 19.0 19.4 19.7 18.6 16.3 14.1 13.9 13.7 15.1 14.8 15.9 17.3 18.6 18.2 13.9 15.3 16.48 1954 19.6 19.8 19.5 17.0 15.9 14.5 13.7 13.8 15.1 16.3 16.1 18.7 18.9 17.5 14.0 15.8 16.55 1955 19.9 20.2 20.2 17.7 15.4 13.5 13.9 13.1 13.7 14.3 16.3 17.8 19.6 17.8 13.5 14.8 16.41 1956 21.7 20.7 20.1 17.3 15.1 13.1 13.2 13.3 14.6 14.8 17.3 18.6 20.1 17.5 13.2 15.6 16.58 1957 20.5 20.1 19.3 17.8 16.7 15.1 13.3 14.5 14.2 15.8 18.3 18.9 19.7 17.9 14.3 16.1 17.02 1958 20.7 20.8 20.2 18.5 16.9 15.2 13.1 13.7 14.1 14.9 17.6 19.3 20.1 18.5 14.0 15.5 17.05 1959 20.3 20.0 20.7 18.1 16.6 15.7 14.7 15.5 14.6 15.6 16.2 17.1 19.9 18.5 15.3 15.5 17.27 1960 18.5 19.7 17.5 16.6 15.3 14.3 12.4 13.5 14.1 15.7 16.9 19.3 18.4 16.5 13.4 15.6 15.97 1961 20.9 22.1 21.2 17.3 17.7 15.1 13.8 13.7 14.9 15.6 17.3 18.5 20.8 18.7 14.2 15.9 17.41 1962 20.8 20.7 19.2 19.6 17.6 16.4 14.3 14.6 14.4 14.4 16.9 19.4 20.0 18.8 15.1 15.2 17.28 1963 20.0 20.2 20.7 18.5 16.8 14.8 13.2 13.8 14.8 16.4 17.5 20.3 19.9 18.7 13.9 16.2 17.18 1964 19.9 19.7 19.3 17.2 16.4 15.0 13.4 13.3 13.8 14.0 16.3 17.0 20.0 17.6 13.9 14.7 16.55 1965 20.7 20.4 19.4 18.5 15.5 999.9 13.7 13.6 14.4 16.0 16.5 19.9 19.4 17.8 14.0 15.6 16.69 1966 20.8 19.8 19.7 17.7 16.5 999.9 13.2 13.6 13.6 15.1 17.6 19.1 20.2 18.0 13.7 15.4 16.82 1967 20.5 20.9 19.7 18.4 16.5 15.6 13.5 12.9 14.7 16.6 17.5 19.2 20.2 18.2 14.0 16.3 17.16 1968 20.4 19.9 17.9 16.7 14.4 13.8 13.5 12.4 13.2 14.6 16.2 19.0 19.8 16.3 13.2 14.7 16.02 1969 19.7 999.9 19.3 17.5 15.9 14.7 13.9 13.5 13.2 16.7 17.4 18.7 19.6 17.6 14.0 15.8 16.75 1970 20.2 20.7 20.6 17.5 16.0 13.9 14.4 13.3 14.2 14.9 16.2 18.2 19.9 18.0 13.9 15.1 16.72 1971 19.9 20.0 19.0 17.5 15.8 14.9 13.9 12.8 12.9 14.1 15.0 17.6 19.4 17.4 13.9 14.0 16.17 1972 20.2 21.7 19.5 17.6 17.0 14.6 13.3 13.1 14.4 15.4 17.5 20.8 19.8 18.0 13.7 15.8 16.82 1973 21.1 19.9 19.1 17.6 16.0 13.1 14.0 13.2 13.6 15.1 16.8 18.1 20.6 17.6 13.4 15.2 16.69 1974 20.1 19.6 19.9 17.9 16.0 15.1 13.8 13.9 15.3 15.2 16.6 18.8 19.3 17.9 14.3 15.7 16.79 1975 19.6 21.9 19.2 17.6 17.2 15.1 13.9 13.5 13.9 15.7 17.1 19.4 20.1 18.0 14.2 15.6 16.96 1976 20.0 21.1 20.4 18.9 17.4 15.2 14.5 14.5 14.8 16.2 16.2 18.6 20.2 18.9 14.7 15.7 17.38 1977 19.9 20.7 18.6 18.5 15.9 14.7 14.6 13.8 14.0 15.3 17.6 19.9 19.7 17.7 14.4 15.6 16.85 1978 20.7 20.7 21.4 19.4 15.9 14.1 999.9 14.2 13.7 15.5 18.1 20.0 20.4 18.9 14.0 15.8 17.27 1979 20.3 20.2 19.6 18.2 15.7 15.2 14.2 13.4 13.9 15.9 17.6 19.7 20.2 17.8 14.3 15.8 17.02 1980 20.5 20.1 20.5 17.8 17.0 14.0 13.8 14.4 14.7 13.8 17.2 18.4 20.1 18.4 14.1 15.2 16.96 1981 20.4 19.1 19.3 18.9 16.1 13.1 14.0 13.2 14.7 15.7 16.7 18.1 19.3 18.1 13.4 15.7 16.63 1982 19.0 20.0 19.1 17.9 16.6 14.2 13.8 14.6 14.8 16.3 18.8 19.5 19.0 17.9 14.2 16.6 16.93 1983 21.3 20.5 21.4 19.4 17.6 16.1 14.4 14.8 15.6 16.4 17.1 19.1 20.4 19.5 15.1 16.4 17.84 1984 20.4 21.0 20.0 18.8 16.4 15.3 13.4 13.6 14.5 16.8 999.9 18.4 20.2 18.4 14.1 16.4 17.27 1985 19.8 999.9 20.7 18.2 16.7 16.3 14.8 14.4 15.2 15.4 17.6 18.3 19.4 18.5 15.2 16.1 17.29 1986 21.3 19.7 18.6 17.7 16.2 14.5 13.0 999.9 14.6 15.0 17.1 17.8 19.8 17.5 13.6 15.6 16.61 1987 19.3 19.5 20.1 18.6 16.4 15.3 13.8 14.5 15.5 15.8 16.8 18.7 18.9 18.4 14.5 16.0 16.95 1988 19.2 21.4 21.1 19.7 17.3 14.9 13.9 14.2 15.3 16.0 16.7 18.6 19.8 19.4 14.3 16.0 17.37 1989 21.0 21.0 20.9 18.8 17.5 15.3 14.1 14.5 14.9 15.1 18.4 18.8 20.2 19.1 14.6 16.1 17.51 1990 19.4 21.5 20.3 18.2 16.4 14.3 13.6 13.2 14.9 15.4 17.2 18.8 19.9 18.3 13.7 15.8 16.93 1991 19.8 20.5 19.5 19.3 17.0 15.4 14.3 14.5 14.8 16.5 16.4 19.3 19.7 18.6 14.7 15.9 17.23 1992 20.5 21.4 20.1 19.1 16.1 15.0 15.0 13.3 13.4 15.7 999.9 19.0 20.4 18.4 14.4 15.3 17.14 1993 20.0 19.8 19.1 17.4 15.8 999.9 13.7 13.7 14.5 14.7 17.4 18.6 19.6 17.4 14.0 15.5 16.64 1994 19.7 19.6 20.6 19.9 17.4 15.1 14.7 14.5 15.2 15.9 18.1 19.8 19.3 19.3 14.8 16.4 17.44 1995 20.5 21.1 20.1 18.7 16.2 14.2 14.1 14.6 15.2 16.2 17.2 19.1 20.5 18.3 14.3 16.2 17.32 1996 20.0 21.7 20.2 19.5 17.7 15.5 14.1 14.6 15.1 16.4 18.8 18.7 20.3 19.1 14.7 16.8 17.73 1997 20.9 20.7 19.4 19.4 16.5 15.7 14.1 13.8 14.9 16.5 17.5 19.8 20.1 18.4 14.5 16.3 17.34 1998 20.5 20.3 20.1 18.8 17.4 14.4 13.5 15.2 14.4 15.6 17.6 19.4 20.2 18.8 14.4 15.9 17.30 1999 20.1 20.8 20.8 20.6 17.6 15.4 14.9 14.3 14.8 15.5 17.7 19.9 20.1 19.7 14.9 16.0 17.66 2000 21.0 21.2 20.0 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 20.7 999.9 999.9 999.9 999.90 2001 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 2002 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 2003 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 2004 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 2005 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 16.7 999.9 999.9 999.9 999.9 999.90 2006 18.3 18.8 19.3 17.0 16.5 14.9 14.3 15.6 15.3 16.0 18.5 19.0 17.9 17.6 14.9 16.6 16.77 2007 19.4 19.8 19.6 17.9 16.7 15.4 15.1 15.0 15.2 15.4 17.2 17.7 19.4 18.1 15.2 15.9 17.14 2008 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 16.6 18.6 999.9 999.9 999.9 999.9 999.90 2009 20.9 20.8 19.7 18.7 17.3 14.9 14.1 14.5 13.7 16.2 999.9 999.9 20.1 18.6 14.5 15.7 17.22