1991-2020 Degrees Fahrenheit 1 61.3 66.3 -5.0 10 120 1983 2002 1973 1974 bottom-tenth 2 58.8 62.4 -3.6 26 104 1973 2017 1973 1974 bottom-third 3 56.0 58.7 -2.7 31 99 1973 2017 1973 1974 bottom-third 1901,1929,1947,1969,2010 4 53.1 55.6 -2.5 30 98 1964 2017 1973 1974 bottom-third 1952 5 51.1 53.7 -2.6 22 105 1913 2017 1973 1974 bottom-third 1933,1988 6 51.1 53.7 -2.6 17 110 1913 2017 1973 1974 bottom-third 1947 7 53.1 55.5 -2.4 18 109 1913 2017 1973 1974 bottom-third 1948,1961,2001 8 55.3 58.2 -2.9 5 122 1913 2017 1973 1974 bottom-tenth 1912,1944,1987 9 57.9 60.8 -2.9 5 122 1913 2017 1973 1974 bottom-tenth 10 60.2 63.2 -3.0 5 122 1913 2017 1939 1974 bottom-tenth 11 62.4 65.0 -2.6 10 117 1913 2017 1973 1974 bottom-tenth 1905,1926,1987 12 63.6 65.9 -2.3 14 113 1913 2017 1973 1974 bottom-third 1958 18 60.3 61.8 -1.5 32 92 1913 2018 1974 1972 bottom-third 1909,1926,1930,1958,1964,1966,1985 24 64.1 65.9 -1.8 22 102 1913 2018 1974 1972 bottom-third 1924,1948,1993 36 63.6 65.8 -2.2 4 117 1915 2019 1941 1974 bottom-tenth 1941 48 64.0 65.8 -1.8 7 111 1915 2020 1916 1974 bottom-tenth 1900,1906,1913,1978,1980 60 64.0 65.7 -1.7 6 109 1916,1977 2021 1917 1974 bottom-tenth 1913,1914