1991-2020 Degrees Fahrenheit 1 36.8 40.2 -3.4 26 59 1989 2015 1980 1979 bottom-third 2 41.8 44.7 -2.9 21 64 1989 2015 1980 1979 bottom-third 1954,2019 3 45.9 49.6 -3.7 10 75 1976,1980 2015 1980 1979 bottom-third 4 51.1 54.9 -3.8 5 79 1976 2015 1980 1979 bottom-tenth 1943,1958 5 56.2 59.5 -3.3 8 76 1962,1976 2015 1980 1979 bottom-tenth 1943 6 59.9 62.8 -2.9 14 70 1962 2015 1980 1979 bottom-third 7 61.9 64.3 -2.4 17 67 1962 2015 1980 1979 bottom-third 1963 8 62.2 64.2 -2.0 19 65 1940,1958,1962 2015 1980 1979 bottom-third 1943,1960,1977 9 61.3 63.0 -1.7 23 61 1940 2015 1980 1979 bottom-third 1964,1965,1966,1977,1988,1997 10 59.4 61.1 -1.7 26 58 1940 2010,2016 1980 1979 bottom-third 1966,2000 11 57.5 58.8 -1.3 37 47 1940 2016 1980 1976 normal 1941,1976,2000,2009 12 54.7 56.8 -2.1 21 63 1940 2012,2016 1980 1979 bottom-third 1944,1979,1989,1992,2014 18 56.4 58.8 -2.4 9 74 1963 2016 1978 1980 bottom-third 1945,1967 24 54.5 56.8 -2.3 9 74 1941 2021 1980 1980 bottom-third 1944,1945,1962,1967,1980 36 54.6 56.8 -2.2 13 69 1942 2022 1980 1977 bottom-third 1962 48 54.3 56.7 -2.4 3 78 1943 2018 1980 1979 bottom-tenth 60 54.3 56.7 -2.4 2 78 1944 2020 1944 1980 bottom-tenth 1982