1991-2020 Degrees Fahrenheit 1 72.8 75.2 -2.4 46 83 1917 1996 1918 1923 normal 2 67.4 70.7 -3.3 23 106 1983 2006 1918 1923 bottom-third 1935 3 62.3 66.6 -4.3 8 121 1973 2018 1917 1923 bottom-tenth 4 59.1 62.8 -3.7 14 115 1973 2018 1917 1923 bottom-third 1909 5 55.8 59.5 -3.7 8 119 1973 2006 1915 1923 bottom-tenth 6 53.7 57.2 -3.5 8 118 1913 2006,2017 1915 1923 bottom-tenth 7 53.4 56.8 -3.4 6 120 1913 2018 1913 1923 bottom-tenth 1926,1964 8 54.7 58.0 -3.3 5 121 1913 2018 1913 1923 bottom-tenth 1973 9 56.9 60.1 -3.2 4 122 1913 2018 1913 1923 bottom-tenth 10 59.1 62.3 -3.2 4 122 1913 2018 1913 1923 bottom-tenth 11 61.3 64.3 -3.0 5 121 1913 2017 1915 1923 bottom-tenth 1915,1939 12 63.0 65.9 -2.9 6 120 1913 2017,2018 1915 1923 bottom-tenth 1899 18 60.8 63.0 -2.2 7 116 1913 2018 1915 1921 bottom-tenth 1906,1940,1945,1949,1973,1980 24 64.0 65.8 -1.8 17 106 1913 2018 1920 1921 bottom-third 1909,1949,1969,1978 36 -99 65.8 -99 -99 -99 1915 2018,2019 normal 48 -99 65.8 -99 -99 -99 1915 2020 normal 60 -99 65.7 -99 -99 -99 1916,1977 2021 normal