1991-2020 Degrees Fahrenheit 1 31.4 40.2 -8.8 6 79 1989 2015 1958 1975 bottom-tenth 2 37.3 44.7 -7.4 3 82 1989 2015 1976 1975 bottom-tenth 3 43.3 49.6 -6.3 1 84 1976,1980 2015 1976 1975 lowest 1980 4 49.6 54.9 -5.3 1 83 1976 2015 1976 1975 lowest 5 54.9 59.5 -4.6 1 83 1962,1976 2015 1962 1975 lowest 1962 6 58.6 62.8 -4.2 2 82 1962 2015 1962 1975 bottom-tenth 7 61.0 64.3 -3.3 4 80 1962 2015 1962 1975 bottom-tenth 8 61.2 64.2 -3.0 6 78 1940,1958,1962 2015 1967 1975 bottom-tenth 9 60.6 63.0 -2.4 13 71 1940 2015 1972 1975 bottom-third 10 59.1 61.1 -2.0 18 66 1940 2010,2016 1972 1975 bottom-third 11 57.5 58.8 -1.3 37 47 1940 2016 1975 1973 normal 1941,1981,2000,2009 12 55.2 56.8 -1.6 33 51 1940 2012,2016 1974 1975 normal 1941,1961,1974,1986,1996 18 57.2 58.8 -1.6 34 49 1963 2016 1972 1975 normal 1951,1959 24 55.4 56.8 -1.4 35 48 1941 2021 1975 1975 normal 1960,1971,1975,1985,1986 36 55.3 56.8 -1.5 34 48 1942 2022 1972 1975 normal 1956,1961 48 55.6 56.7 -1.1 43 38 1943 2018 1975 1957 normal 1957,1995 60 55.4 56.7 -1.3 36 44 1944 2020 1974 1975 normal 1974,1977,1987