1925-2000 Degrees Fahrenheit 1 54.0 55.8 -1.8 23 76 2006 2004 1970 1971 bottom-third 1996 2 56.3 56.0 0.3 63 36 1969,2008 1927 1970 1971 normal 1931 3 54.1 55.4 -1.3 27 72 2008 1927 1970 1971 bottom-third 1976,2000,2014 4 51.9 53.5 -1.6 13 86 2008,2012 2004 1970 1971 bottom-third 2017 5 48.5 50.9 -2.4 6 93 2008 1993,2004 1970 1971 bottom-tenth 1973,1975 6 45.1 48.0 -2.9 3 96 1955 1993 1955 1971 bottom-tenth 7 41.7 45.1 -3.4 1 98 1972 2004 1972 1971 lowest 8 38.8 42.6 -3.8 1 98 1972 1926 1972 1971 lowest 9 36.8 40.9 -4.1 1 97 1972 1926 1972 1971 lowest 10 36.1 39.9 -3.8 1 97 1972 1926 1972 1971 lowest 11 36.3 40.0 -3.7 1 97 1972 1926 1972 1971 lowest 12 37.2 40.8 -3.6 1 97 1972 1926 1972 1971 lowest 18 40.3 43.2 -2.9 2 96 1956 1926 1956 1971 bottom-tenth 24 37.8 40.8 -3.0 1 96 1972 1927 1972 1971 lowest 36 38.8 40.8 -2.0 3 93 1973 1928 1972 1971 bottom-tenth 48 38.7 40.8 -2.1 3 92 1974 1929 1972 1971 bottom-tenth 60 39.2 40.7 -1.5 5 89 1975 1930 1972 1971 bottom-tenth