1991-2020 Degrees Fahrenheit 1 31.2 30.8 0.4 84 41 2000 2015 1951 1952 top-third 2 36.6 35.9 0.7 95 29 1976 2015 1952 1941 top-third 3 43.1 41.6 1.5 104 18 1976 2015 1952 1941 top-third 2020 4 48.4 47.5 0.9 99 23 1976 1931 1952 1941 top-third 1897,2020 5 53.3 52.4 0.9 106 16 1976 1931 1952 1941 top-third 1908,1922,1994,2019,2020 6 56.9 55.9 1.0 106 16 1976 1931 1952 1941 top-third 1900 7 59.0 57.9 1.1 107 15 1976 1931 1952 1941 top-third 2001 8 59.3 58.2 1.1 108 14 1917 1931,2015,2021 1952 1941 top-third 2001 9 57.6 57.2 0.4 95 26 1917 2015 1952 1941 top-third 1959,1971,1994,2017 10 55.7 55.3 0.4 101 20 1917 2012 1952 1941 top-third 2017 11 53.5 52.8 0.7 104 16 1917 2012 1952 1931 top-third 2015 12 51.4 50.5 0.9 103 13 1917 2012 1952 1931 top-third 2007 18 52.5 52.3 0.2 92 20 1904 2012 1952 1941 top-third 2018,2019 24 50.7 50.5 0.2 85 22 1904 1999,2017 1952 1934 top-third 1992,2019 36 49.7 50.5 -0.8 57 42 1904 2012,2017,2018 1952 1934 normal 1973,1984,1986,1998,2010 48 49.2 50.5 -1.3 35 59 1904 2018 1952 1934 normal 1914 60 49.5 50.5 -1.0 40 49 1980 2020,2021 1952 1934 normal 1902,1959,1974,1985