1991-2020 Degrees Fahrenheit 1 58.4 59.6 -1.2 36 50 1967 2015 1938 1939 normal 2 50.4 53.7 -3.3 7 77 1966 1991 1940 1939 bottom-tenth 1971 3 42.5 47.5 -5.0 1 83 1940 2012 1940 1939 lowest 4 37.5 42.4 -4.9 1 83 1940,1978 2012 1940 1939 lowest 1978 5 33.2 39.0 -5.8 1 83 1940 2012 1940 1939 lowest 6 32.6 37.8 -5.2 1 83 1940 2012 1940 1939 lowest 7 33.0 38.4 -5.4 1 83 1940 2012 1940 1939 lowest 8 35.3 40.2 -4.9 1 83 1940 2012 1940 1939 lowest 9 38.5 42.8 -4.3 1 83 1940 2012 1940 1939 lowest 10 42.0 45.7 -3.7 1 83 1940 2012 1940 1939 lowest 11 44.8 48.2 -3.4 1 83 1940,1963 2012 1940 1939 lowest 1963 12 46.8 49.9 -3.1 1 83 1940,1963 2012 1940 1939 lowest 1963 18 43.3 45.9 -2.6 4 78 1941 2013 1940 1940 bottom-tenth 24 47.8 50.0 -2.2 6 76 1978 2013 1940 1940 bottom-tenth 1967 36 -99 50.0 -99 -99 -99 1979 2013 normal 48 -99 50.1 -99 -99 -99 1980 2013 normal 60 -99 50.1 -99 -99 -99 1970,1981 2013 normal