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 1881 17.4 19.4 19.2 16.4 14.3 11.4 11.9 12.1 13.3 14.0 16.3 17.8 18.2 16.6 11.8 14.5 15.29 1882 17.7 19.4 17.6 16.2 13.3 11.5 11.3 11.8 13.0 13.9 14.9 17.7 18.3 15.7 11.5 13.9 14.87 1883 17.5 18.0 16.5 16.5 14.2 12.9 11.4 11.1 11.6 13.3 14.9 18.4 17.7 15.7 11.8 13.3 14.63 1884 18.1 18.7 17.9 15.4 13.9 11.3 10.7 13.0 12.7 13.8 16.4 15.8 18.4 15.7 11.7 14.3 15.03 1885 18.6 17.6 17.0 15.6 13.3 12.3 12.2 11.5 11.8 14.1 15.6 18.3 17.3 15.3 12.0 13.8 14.62 1886 17.5 18.7 18.1 15.5 13.7 12.1 10.7 10.8 13.0 12.5 15.6 16.9 18.2 15.8 11.2 13.7 14.71 1887 17.0 17.6 16.2 14.7 12.9 10.8 11.0 11.0 12.0 14.4 16.5 18.6 17.2 14.6 10.9 14.3 14.25 1888 18.7 18.4 19.1 16.5 14.0 11.9 11.3 10.9 12.7 14.7 18.3 19.1 18.6 16.5 11.4 15.2 15.43 1889 19.5 19.4 18.2 16.9 13.1 11.1 10.5 10.8 11.8 13.0 14.9 16.9 19.3 16.1 10.8 13.2 14.86 1890 18.4 18.9 17.6 16.6 14.2 11.6 9.9 11.0 12.4 12.6 15.6 17.3 18.1 16.1 10.8 13.5 14.64 1891 17.5 18.5 18.5 17.5 14.3 11.9 11.8 12.0 12.5 14.1 17.5 18.1 17.8 16.8 11.9 14.7 15.28 1892 18.3 18.3 17.3 15.9 14.0 11.6 10.7 10.8 12.7 13.2 15.2 18.5 18.2 15.7 11.0 13.7 14.68 1893 18.1 18.4 18.9 15.2 13.5 11.2 11.2 11.7 12.6 13.5 15.4 18.0 18.3 15.9 11.4 13.8 14.85 1894 18.5 18.0 18.0 16.4 13.8 13.0 11.4 12.0 12.7 15.7 16.0 18.4 18.2 16.1 12.1 14.8 15.29 1895 17.9 17.3 18.2 15.0 14.2 12.2 11.3 13.4 13.2 13.9 16.6 17.9 17.9 15.8 12.3 14.6 15.13 1896 19.3 19.3 18.0 15.8 14.5 12.9 10.8 12.1 12.8 15.8 16.2 17.4 18.8 16.1 11.9 14.9 15.45 1897 18.4 17.9 17.7 16.6 14.0 12.5 12.4 11.6 13.8 13.3 16.1 17.2 17.9 16.1 12.2 14.4 15.14 1898 18.8 19.4 18.1 16.1 14.7 11.7 12.1 13.0 14.2 14.7 15.6 17.6 18.5 16.3 12.3 14.8 15.47 1899 18.1 19.3 18.1 15.6 14.2 12.5 11.7 12.3 12.2 14.7 15.3 17.8 18.3 16.0 12.2 14.1 15.13 1900 17.8 19.2 15.7 15.4 13.3 12.1 11.3 11.1 12.4 14.6 16.1 17.6 18.3 14.8 11.5 14.4 14.73 1901 19.1 18.9 17.9 16.3 14.3 11.9 11.3 12.5 13.5 14.9 16.4 17.1 18.5 16.2 11.9 14.9 15.38 1902 17.2 17.5 18.5 16.9 14.2 12.1 11.3 12.7 13.3 13.7 15.9 16.7 17.3 16.5 12.0 14.3 15.03 1903 18.5 18.5 16.1 14.6 13.4 12.2 10.9 11.5 12.3 12.9 16.1 17.3 17.9 14.7 11.5 13.8 14.47 1904 18.7 18.0 18.9 16.5 13.6 12.5 11.3 12.4 13.2 14.0 16.0 17.7 18.0 16.3 12.1 14.4 15.20 1905 17.7 17.4 16.3 16.2 14.0 11.8 11.8 10.9 11.3 13.4 15.7 17.8 17.6 15.5 11.5 13.5 14.52 1906 19.5 19.3 18.5 17.3 14.7 12.8 10.9 12.2 11.8 14.7 16.0 18.4 18.9 16.8 12.0 14.2 15.46 1907 18.9 19.8 18.6 16.7 15.5 13.5 12.6 13.4 12.8 13.9 15.3 16.7 19.0 16.9 13.2 14.0 15.78 1908 18.5 18.2 17.0 16.7 14.9 12.0 12.3 12.2 13.1 14.3 16.3 17.9 17.8 16.2 12.2 14.6 15.18 1909 19.1 19.6 17.7 16.0 15.0 13.1 11.8 11.9 14.2 14.6 15.8 19.4 18.9 16.2 12.3 14.9 15.56 1910 19.6 20.0 19.5 18.5 14.1 12.2 11.4 12.8 13.6 13.6 15.7 16.9 19.7 17.4 12.1 14.3 15.87 1911 20.5 20.1 18.2 16.7 14.3 13.4 12.2 12.5 12.8 13.6 16.8 16.8 19.2 16.4 12.7 14.4 15.67 1912 19.3 19.9 18.6 17.1 14.8 12.8 12.1 12.5 12.5 14.0 15.5 17.9 18.7 16.8 12.5 14.0 15.49 1913 18.7 18.6 17.6 16.5 15.5 13.6 12.5 12.0 13.9 14.7 16.6 17.6 18.4 16.5 12.7 15.1 15.68 1914 18.5 18.6 17.6 15.7 14.0 13.4 12.3 14.1 14.5 17.4 17.2 18.4 18.2 15.8 13.3 16.4 15.91 1915 20.2 20.0 18.3 17.7 15.7 14.0 13.2 12.6 12.4 14.7 17.2 18.9 19.5 17.2 13.3 14.8 16.20 1916 18.8 19.4 18.8 16.8 15.8 12.3 11.7 12.1 14.3 14.1 16.6 18.6 19.0 17.1 12.0 15.0 15.80 1917 18.6 19.1 18.1 17.7 13.8 12.5 12.2 12.1 13.5 13.2 17.3 19.7 18.8 16.5 12.3 14.7 15.56 1918 20.9 19.0 18.6 18.4 15.2 13.9 12.3 13.1 999.9 999.9 18.2 18.5 19.9 17.4 13.1 999.9 16.49 1919 19.0 19.1 19.7 17.3 14.6 12.4 13.0 12.5 13.3 14.1 16.6 17.9 18.9 17.2 12.6 14.7 15.84 1920 20.9 19.5 19.4 17.6 15.3 13.0 11.7 11.7 14.0 15.8 17.6 18.8 19.4 17.4 12.1 15.8 16.20 1921 20.0 21.9 20.7 18.0 16.1 14.3 13.7 13.2 13.8 14.4 16.3 18.4 20.2 18.3 13.7 14.8 16.77 1922 18.6 19.1 19.5 17.2 13.8 12.8 11.2 12.8 13.3 14.7 16.6 18.2 18.7 16.8 12.3 14.9 15.67 1923 18.5 20.9 19.6 18.0 15.5 12.8 12.7 12.6 12.6 14.3 16.1 17.3 19.2 17.7 12.7 14.3 15.98 1924 19.0 18.9 17.6 17.6 15.8 13.8 13.3 12.2 12.9 13.3 15.8 17.9 18.4 17.0 13.1 14.0 15.62 1925 19.0 18.7 18.6 16.6 14.7 13.0 11.5 11.4 13.5 13.5 17.5 19.0 18.5 16.6 12.0 14.8 15.49 1926 19.7 18.8 17.9 16.4 14.6 12.6 11.8 11.6 13.1 14.6 16.4 17.1 19.2 16.3 12.0 14.7 15.54 1927 17.6 18.3 16.8 18.0 14.1 11.8 11.5 12.4 14.0 14.7 16.8 19.0 17.7 16.3 11.9 15.2 15.26 1928 18.4 18.1 18.2 17.3 14.4 12.7 12.1 12.8 12.8 13.3 16.3 17.7 18.5 16.6 12.5 14.1 15.45 1929 18.0 18.9 17.3 16.0 13.7 12.1 11.5 11.4 13.3 14.4 16.3 17.7 18.2 15.7 11.7 14.7 15.05 1930 19.4 19.1 19.4 17.3 16.2 14.3 12.5 12.6 13.2 15.2 16.3 18.0 18.7 17.6 13.1 14.9 16.10 1931 19.5 18.1 18.6 16.7 13.0 11.1 12.1 12.3 12.8 14.6 16.2 19.1 18.5 16.1 11.8 14.5 15.25 1932 19.9 19.8 17.9 16.8 15.0 13.3 11.9 11.6 13.5 14.5 16.8 18.0 19.6 16.6 12.3 14.9 15.84 1933 18.7 20.9 18.2 16.7 14.7 13.7 11.8 11.9 13.9 15.0 16.6 18.7 19.2 16.5 12.5 15.2 15.84 1934 20.2 20.9 19.6 17.1 16.0 13.4 12.5 12.8 13.7 13.9 15.2 17.5 19.9 17.6 12.9 14.3 16.17 1935 18.9 19.0 18.0 17.1 14.6 12.6 11.5 12.1 13.0 13.5 15.4 17.4 18.5 16.6 12.1 14.0 15.27 1936 18.9 18.9 19.0 17.2 14.1 12.3 12.0 12.7 14.3 14.6 17.9 18.9 18.4 16.8 12.3 15.6 15.78 1937 18.9 19.7 18.7 18.7 14.9 13.2 12.0 12.0 13.4 15.3 16.5 17.1 19.2 17.4 12.4 15.1 16.02 1938 18.3 17.8 17.7 16.2 14.2 12.3 12.1 13.0 13.7 14.8 16.9 999.9 17.7 16.0 12.5 15.1 15.34 1939 19.0 19.2 18.4 17.3 15.1 12.8 12.4 12.0 13.7 14.8 16.7 17.8 18.7 16.9 12.4 15.1 15.78 1940 19.2 20.1 19.1 16.0 14.4 14.2 12.7 13.1 13.4 15.1 16.5 17.7 19.0 16.5 13.3 15.0 15.97 1941 17.9 18.6 17.5 16.0 14.7 14.0 12.7 13.3 12.5 14.3 17.7 19.4 18.1 16.1 13.3 14.8 15.58 1942 18.3 19.1 17.9 17.4 15.2 12.8 12.1 12.3 13.0 13.8 17.0 18.6 18.9 16.8 12.4 14.6 15.69 1943 18.1 18.6 18.5 15.9 14.3 13.6 11.0 11.7 13.0 14.4 16.4 17.4 18.4 16.2 12.1 14.6 15.34 1944 18.9 18.8 17.8 16.1 13.6 13.8 12.5 13.2 13.5 15.8 17.0 17.6 18.4 15.8 13.2 15.4 15.70 1945 18.2 19.5 18.6 18.6 16.0 13.3 12.2 12.5 13.0 14.9 16.6 18.2 18.4 17.7 12.7 14.8 15.92 1946 18.0 17.8 17.3 17.1 14.8 13.0 12.1 12.3 14.0 15.0 15.7 17.8 18.0 16.4 12.5 14.9 15.44 1947 18.8 19.1 18.3 17.3 14.5 13.8 12.0 12.3 13.2 13.8 15.9 17.5 18.6 16.7 12.7 14.3 15.57 1948 19.5 20.1 20.0 16.3 15.4 13.4 12.0 13.4 13.4 14.8 15.7 17.1 19.0 17.2 12.9 14.6 15.96 1949 19.9 19.2 18.5 18.2 14.9 13.9 13.4 13.4 13.8 13.9 16.0 18.6 18.7 17.2 13.6 14.6 16.02 1950 19.4 19.7 19.6 18.5 15.4 13.5 12.5 13.0 13.4 14.1 15.8 18.1 19.2 17.8 13.0 14.4 16.12 1951 19.4 19.1 18.7 16.6 14.0 12.7 12.0 10.8 14.8 14.8 17.2 18.2 18.9 16.4 11.8 15.6 15.68 1952 19.1 19.3 19.0 16.8 14.0 13.7 11.2 12.6 12.4 14.1 15.9 17.0 18.9 16.6 12.5 14.1 15.53 1953 19.0 18.8 19.3 17.5 15.2 12.6 12.2 12.1 13.4 14.1 16.0 16.7 18.3 17.3 12.3 14.5 15.60 1954 19.8 19.4 18.5 15.7 14.3 12.8 12.1 12.2 14.2 15.6 16.2 18.6 18.6 16.2 12.4 15.3 15.62 1955 19.5 19.6 19.3 16.4 14.2 12.1 11.8 11.6 14.1 13.6 15.9 17.3 19.2 16.6 11.8 14.5 15.56 1956 20.8 20.2 19.7 15.6 13.9 11.2 11.2 11.4 13.5 14.0 16.8 18.3 19.4 16.4 11.3 14.8 15.47 1957 20.3 19.9 19.0 16.7 15.1 13.7 11.5 13.2 13.5 15.5 17.5 18.4 19.5 16.9 12.8 15.5 16.18 1958 20.7 20.1 19.5 17.7 15.4 13.2 11.3 12.7 12.8 14.3 17.4 18.4 19.7 17.5 12.4 14.8 16.12 1959 20.1 19.7 19.7 17.6 15.5 14.4 12.3 14.0 13.8 15.4 17.3 16.6 19.4 17.6 13.6 15.5 16.52 1960 18.0 19.4 17.2 15.2 13.6 12.3 11.0 11.6 13.3 15.3 15.9 18.3 18.0 15.3 11.6 14.8 14.95 1961 20.5 21.7 20.5 16.3 16.1 13.2 12.5 12.4 14.7 15.0 17.3 18.4 20.2 17.6 12.7 15.7 16.54 1962 20.2 19.7 18.7 18.2 15.7 14.3 12.3 13.5 13.3 13.9 17.3 18.8 19.4 17.5 13.4 14.8 16.29 1963 19.4 19.8 20.1 17.3 15.7 12.9 11.9 12.8 13.9 16.5 17.3 19.6 19.3 17.7 12.5 15.9 16.37 1964 19.4 19.4 19.1 16.3 14.7 14.2 12.2 12.0 12.9 13.1 15.8 17.2 19.5 16.7 12.8 13.9 15.73 1965 20.5 19.7 19.4 18.4 999.9 999.9 999.9 999.9 999.9 999.9 999.9 999.9 19.1 17.9 999.9 999.9 999.90