1991-2020 Degrees Fahrenheit 1 75.4 75.1 0.3 107 23 1917 1996 1942 1934 top-third 2 71.8 70.7 1.1 116 14 1983 2006,2018 1942 1934 top-third 3 66.9 66.6 0.3 109 21 1973 2018 1942 1934 top-third 1963 4 63.3 62.7 0.6 115 15 1973 2018 1942 1934 top-third 5 59.8 59.4 0.4 109 19 1973 2006,2017,2018 1941 1934 top-third 1925,1954,1986,2003 6 58.0 57.2 0.8 114 13 1913 2006,2017 1941 1934 top-tenth 1927 7 57.8 56.7 1.1 118 9 1913 2018 1941 1934 top-tenth 1907,1916,2009 8 58.5 57.9 0.6 111 16 1977 2018 1941 1934 top-third 9 60.1 60.0 0.1 100 27 1977 2018 1941 1938 top-third 1925,1956,2012 10 61.9 62.2 -0.3 90 37 1977 2018 1941 1938 top-third 1957,1963,1974 11 63.8 64.2 -0.4 92 35 1977 2017,2018 1941 1938 top-third 1932,1956,1963,2015 12 65.3 65.8 -0.5 88 39 1977 2017,2018 1941 1938 top-third 1950,1959 18 -99 62.9 -99 -99 -99 1913 2018 normal 24 -99 65.8 -99 -99 -99 1913 2018 normal 36 -99 65.8 -99 -99 -99 1915 2018 normal 48 -99 65.7 -99 -99 -99 1915 2020 normal 60 -99 65.7 -99 -99 -99 1977 2021 normal