YEAR |
Summer |
Fall |
Winter |
Spring |
|
D-J-F |
M-A-M |
J-J-A |
S-O-N |
Avg |
|
1887 | 20.9 | 17.6 | 13.8 | 18 | 17.57 |
1888 | 20.3 | 18 | 15.3 | 21.3 | 18.75 |
1889 | 22.6 | 20 | 13.7 | 17.1 | 18.35 |
1890 | 21.8 | 18 | 13.6 | 17 | 17.61 |
1891 | 21 | 18.4 | 14.7 | 17.9 | 18 |
1892 | 21.2 | 18.3 | 13.4 | 17.2 | 17.51 |
1893 | 19.6 | 17.7 | 13.4 | 15.7 | 16.59 |
1894 | 21.7 | 17.6 | 13.2 | 18.5 | 17.76 |
1895 | 20.5 | 18 | 14.2 | 17.5 | 17.57 |
1896 | 21.5 | 17.2 | 14.6 | 18.3 | 17.91 |
1897 | 21 | 19.1 | 14.4 | 17.2 | 17.9 |
1898 | 21.7 | 18.5 | 14.7 | 16.4 | 17.83 |
1899 | 20.8 | 20 | 15.7 | 18.6 | 18.78 |
1900 | 20.4 | 18.5 | 15.1 | 18.1 | 18.04 |
1901 | 19.9 | 17.4 | 14.3 | 17.3 | 17.22 |
1902 | 20.3 | 18.7 | 14.9 | 18.1 | 18 |
1903 | 20.2 | 17.8 | 14.5 | 17.2 | 17.42 |
1904 | 20.5 | 17.4 | 14.1 | 17.5 | 17.38 |
1905 | 20.3 | 18.1 | 14.6 | 18.1 | 17.78 |
1906 | 20 | 18.2 | 15.5 | 17.6 | 17.83 |
1907 | 20.3 | 17.5 | 13.8 | 17.6 | 17.32 |
1908 | 20.4 | 17.4 | 14.4 | 17.4 | 17.42 |
1909 | 21.2 | 16.9 | 14.8 | 17 | 17.49 |
1910 | 20.2 | 17.8 | 14.6 | 16.1 | 17.18 |
1911 | 20.2 | 17.4 | 13.1 | 17.6 | 17.06 |
1912 | 20.9 | 18.3 | 14.6 | 16.7 | 17.62 |
1913 | 20.3 | 18.7 | 15.1 | 17.8 | 17.98 |
1914 | 20.6 | 18.3 | 16.8 | 19.1 | 18.7 |
1915 | 21.2 | 20 | 15.4 | 17.2 | 18.45 |
1916 | 20 | 18.1 | 15.4 | 17.7 | 17.81 |
1917 | 19.9 | 16.9 | 13.3 | 16.6 | 16.67 |
1918 | 20.2 | 18.1 | 14 | 17.3 | 17.42 |
1919 | 19.5 | 19.6 | 16.2 | 16.8 | 18.03 |
1920 | 20.6 | 18.2 | 14.4 | 17.4 | 17.68 |
1921 | 20.5 | 18.5 | 14.9 | 16.7 | 17.66 |
1922 | 20.9 | 18.9 | 15.7 | 17.3 | 18.2 |
1923 | 20.5 | 19 | 14.7 | 17.2 | 17.83 |
1924 | 20.4 | 19.1 | 14.8 | 15.8 | 17.54 |
1925 | 20.8 | 19 | 14.3 | 17.5 | 17.91 |
1926 | 20.2 | 18.2 | 15.3 | 18.2 | 17.96 |
1927 | 20.2 | 18.5 | 14.3 | 17.8 | 17.72 |
1928 | 20.8 | 19.7 | 15.5 | 18.2 | 18.56 |
1929 | 21.1 | 17.6 | 15.5 | 18.2 | 18.08 |
1930 | 21.1 | 19 | 16.6 | 17.6 | 18.58 |
1931 | 20.7 | 18.7 | 15.2 | 17.3 | 17.98 |
1932 | 21.2 | 19.6 | 15.6 | 19.1 | 18.88 |
1933 | 21 | 18 | 14.8 | 17.5 | 17.82 |
1934 | 20.7 | 19.4 | 15.7 | 18.1 | 18.47 |
1935 | 20.2 | 17.3 | 15.4 | 17.1 | 17.51 |
1936 | 20.5 | 18.9 | 15.2 | 17 | 17.89 |
1937 | 19.9 | 17.6 | 15.5 | 16.6 | 17.39 |
1938 | 20.4 | 18.4 | 14.5 | 17.2 | 17.63 |
1939 | 20.5 | 19 | 14.8 | 17.2 | 17.85 |
1940 | 20.2 | 19.5 | 16.1 | 17.2 | 18.26 |
1941 | 23 | 20.2 | 15.6 | 17.5 | 19.09 |
1942 | 21.6 | 19.4 | 14.7 | 18.6 | 18.6 |
1943 | 20.5 | 19 | 15.9 | 18.3 | 18.43 |
1944 | 21.3 | 19.3 | 15 | 19.3 | 18.75 |
1945 | - | - | - | - | - |
1946 | 21.1 | 18.2 | 15 | 18.3 | 18.14 |
1947 | 21 | 18.3 | 14 | 16.3 | 17.38 |
1948 | 20.6 | 17.9 | 15 | 17.6 | 17.75 |
1949 | 20 | 18.5 | 15.2 | 17.1 | 17.7 |
1950 | 20.2 | 19 | 16.1 | 17.7 | 18.26 |
1951 | 20.4 | 17.7 | 14 | 18.2 | 17.58 |
1952 | 20.3 | 18.3 | 16.2 | 18.5 | 18.32 |
1953 | 21.1 | 18.9 | 15.1 | 18.5 | 18.38 |
1954 | 21.4 | 18.8 | 16.4 | 18.6 | 18.81 |
1955 | 21.1 | 18.8 | 15.4 | 17.3 | 18.15 |
1956 | 22.1 | 18.1 | 14.1 | 17.8 | 18.02 |
1957 | 20.6 | 18.3 | 15.6 | 18.7 | 18.29 |
1958 | 22.1 | 18.8 | 16.9 | 19 | 19.19 |
1959 | 22.2 | 20 | 16.3 | 19.2 | 19.41 |
1960 | 20.6 | 18.1 | 16 | 19.2 | 18.48 |
1961 | 21.4 | 19.5 | 16.9 | 20.8 | 19.64 |
1962 | 20.8 | 18.8 | 14.6 | 18.6 | 18.22 |
1963 | 21.3 | 19.3 | 16.1 | 20.3 | 19.26 |
1964 | 20.9 | 19.1 | 15.8 | 18.1 | 18.48 |
1965 | 20.4 | 18.5 | 16.8 | 19.6 | 18.83 |
1966 | 22.7 | 19.2 | 16.4 | 18.2 | 19.13 |
1967 | 21.6 | 19.5 | 17.3 | 19.4 | 19.43 |
1968 | 20.2 | 17.6 | 14.7 | 18.8 | 17.82 |
1969 | 22.4 | 19.3 | 16.4 | 18.7 | 19.22 |
1970 | 20.8 | 20.4 | 16.6 | 18 | 18.96 |
1971 | 22.9 | 19.5 | 16 | 18 | 19.1 |
1972 | 21.4 | 19.5 | 17.3 | 19.1 | 19.33 |
1973 | 22.8 | 20.4 | 17 | 17 | 19.3 |
1974 | 21.6 | 19.2 | 16.3 | 18.3 | 18.85 |
1975 | 21.3 | 19.3 | 16.7 | 19.4 | 19.18 |
1976 | 22 | 19.1 | 15.7 | 18.5 | 18.8 |
1977 | 22.7 | 19.9 | 17.6 | 19.8 | 20 |
1978 | 21.8 | 19.1 | 16.6 | 18.8 | 19.09 |
1979 | 20.6 | 19.1 | 16.4 | 18.7 | 18.68 |
1980 | 21.6 | 20.8 | 16.8 | 18.6 | 19.47 |
1981 | 22.9 | 19.7 | 15.7 | 19.5 | 19.45 |
1982 | 20.6 | 18.6 | 17.7 | 19.7 | 19.15 |
1983 | 22 | 20.3 | 17.1 | 18.7 | 19.53 |
1984 | 23.6 | 20.7 | 17.1 | 19.4 | 20.22 |
1985 | 21.5 | 20.4 | 16.2 | 19.5 | 19.38 |
1986 | 22.7 | 21 | 16.7 | 19.4 | 19.97 |
1987 | 22.6 | 20.1 | 16.8 | 18.5 | 19.48 |
1988 | 22.5 | 20.6 | 15.5 | 19.4 | 19.51 |
1989 | 22.4 | 20.3 | 16.6 | 18.4 | 19.4 |
1990 | 22.1 | 21.1 | 15.8 | 19.5 | 19.64 |
1991 | 21.9 | 19.9 | 17.1 | 19.5 | 19.61 |
1992 | 22.6 | 20.8 | 17 | 19.6 | 20 |
1993 | 22.7 | 20.6 | - | 20.2 | 20.18 |
1994 | 22.6 | 20.1 | 16.4 | 19.5 | 19.64 |
1995 | 23.5 | 20.3 | 18.6 | 19.3 | 20.45 |
1996 | 23.2 | 20.3 | 16.1 | 19.4 | 19.77 |
1997 | 22.8 | 19.8 | 17.1 | 20.7 | 20.12 |
1998 | 24.1 | 20.6 | 17.5 | 19.5 | 20.44 |
1999 | 23.3 | 19.9 | 17 | 18.4 | 19.65 |
2000 | 22.4 | 20 | 16.8 | 20.6 | 19.94 |
2001 | 23.7 | 21.5 | 17.8 | 20.1 | 20.77 |
2002 | 22.1 | 22.2 | 18.7 | 21.1 | 21.03 |
2003 | 23.8 | 20.7 | 17.7 | 19.9 | 20.51 |
2004 | 21.8 | 20 | 16.8 | 20.5 | 19.78 |
2005 | 22.1 | 21.5 | 18.2 | 19.9 | 20.43 |
2006 | 22.8 | 20.1 | 18.1 | 19.9 | 20.22 |
2007 | 23.1 | 21.3 | 17.9 | 20.7 | 20.73 |
2008 | 22.3 | 20.3 | 17.8 | 19.8 | 20.03 |
2009 | 22.5 | 21.2 | 17.1 | 21.3 | 20.51 |
2010 | 23.6 | 20.8 | - | - | - |