1991-2020 Degrees Fahrenheit 1 38.6 44.7 -6.1 14 114 1917 2015 1963 1980 bottom-third 2 44.3 48.1 -3.8 20 108 1901 2015 1976 1980 bottom-third 3 48.7 52.6 -3.9 7 120 1917 1931 1976 1980 bottom-tenth 1937 4 53.6 57.5 -3.9 5 122 1917 1931 1976 1980 bottom-tenth 1903 5 57.9 61.7 -3.8 4 123 1917 2007 1976 1980 bottom-tenth 6 61.5 64.7 -3.2 4 123 1917 1931 1976 1980 bottom-tenth 1909,1967 7 64.1 66.3 -2.2 17 110 1917,1976 2016 1979 1980 bottom-third 1916 8 64.3 66.6 -2.3 12 115 1917 1998,2015,2016 1976 1980 bottom-tenth 1929,1963,1968,1989 9 64.2 66.0 -1.8 26 101 1976 2015 1979 1980 bottom-third 1912,1916,1937,1963 10 62.6 64.7 -2.1 15 112 1901,1917 2016 1976 1980 bottom-third 1960,1989 11 60.8 62.9 -2.1 20 107 1901 2016 1980 1979 bottom-third 1914,1979 12 58.8 61.2 -2.4 14 112 1901 2016 1979 1980 bottom-third 1979 18 60.4 62.4 -2.0 19 106 1904 2016,2017 1980 1979 bottom-third 1914,1924,1977 24 59.0 61.2 -2.2 13 111 1902 2017 1980 1978 bottom-third 1968,1984 36 58.9 61.2 -2.3 7 115 1903 2017 1980 1980 bottom-tenth 1906,1980 48 58.9 61.2 -2.3 6 114 1904 2019 1969 1980 bottom-tenth 1902,1969 60 59.2 61.1 -1.9 12 106 1905 2019 1980 1979 bottom-tenth 1970