1991-2020 Degrees Fahrenheit 1 42.3 38.3 4.0 81 8 1984 2012 1976 1946 top-tenth 2 35.3 35.1 0.2 63 26 2015 2012 1975 1976 top-third 1953 3 30.5 33.4 -2.9 27 62 2015 2012 1971 1976 bottom-third 1956 4 29.5 34.0 -4.5 13 75 1948,1959 2012 1971 1976 bottom-third 1994 5 31.5 36.2 -4.7 8 80 1948 2012 1963 1976 bottom-tenth 6 34.6 39.3 -4.7 4 84 1940 2012 1959 1976 bottom-tenth 7 38.6 43.0 -4.4 3 85 1940,1941 2012 1963 1976 bottom-tenth 1959,1963 8 42.5 46.7 -4.2 4 84 1941 2012 1963 1976 bottom-tenth 9 45.6 49.8 -4.2 3 85 1941 2012 1963 1976 bottom-tenth 1940 10 48.1 51.6 -3.5 8 80 1941 2012 1968 1976 bottom-tenth 11 49.0 52.2 -3.2 7 81 1941 2012 1968 1976 bottom-tenth 1948 12 49.3 51.9 -2.6 13 75 1941 2012 1969 1976 bottom-third 1939,1969,1979 18 45.9 47.6 -1.7 41 46 1941 2023 1973 1976 normal 1973 24 49.9 51.8 -1.9 34 53 1941 2023 1971 1976 normal 36 49.8 51.8 -2.0 25 61 1941 2023 1972 1976 bottom-third 1947,1972,1978,1982 48 50.2 51.8 -1.6 35 50 1941 2023 1976 1976 normal 1950,1974,1976,1984,1988,1989 60 50.1 51.7 -1.6 31 53 1941 2023 1975 1976 normal 1950,1974,1975