1925-2000 Degrees Fahrenheit 1 46.9 49.6 -2.7 4 95 1992 1995 1992 2007 bottom-tenth 2 49.5 52.7 -3.2 2 97 1970 1927 1970 2007 bottom-tenth 1955 3 49.8 53.8 -4.0 1 98 1970,2008 1927 1970 2007 lowest 1970 4 49.7 54.0 -4.3 1 98 2008 1927 2008 2007 lowest 5 49.1 52.7 -3.6 2 97 1970 1927 1970 2007 bottom-tenth 6 47.2 50.7 -3.5 1 98 1970,2008 1993 1970 2007 lowest 1970 7 45.2 48.2 -3.0 1 98 1955,2008 1926,1993 1955 2007 lowest 1955 8 42.9 45.7 -2.8 2 97 1972 1926,1993 1972 2007 bottom-tenth 9 40.8 43.4 -2.6 2 97 1972 1926 1972 2007 bottom-tenth 10 39.1 41.8 -2.7 2 96 1972 1926 1972 2007 bottom-tenth 1956 11 38.5 40.8 -2.3 3 95 1972 1926 1972 2007 bottom-tenth 1933,1971 12 38.6 40.8 -2.2 4 94 1972 1926 1972 2007 bottom-tenth 18 42.3 44.1 -1.8 6 92 1956 1926 1974 2007 bottom-tenth 24 38.9 40.8 -1.9 6 91 1972 1927 1974 2007 bottom-tenth 36 39.5 40.8 -1.3 13 83 1973 1928 1976 2007 bottom-third 1966 48 40.3 40.8 -0.5 26 69 1974 1929 1977 2007 bottom-third 1935,1959 60 40.9 40.7 0.2 49 45 1975 1930 1988 2007 normal 1935,1940,1982,1987,1988,2015