1901-2000 Degrees Fahrenheit 1 55.6 54.0 1.6 88 42 1907 2017 1975 1974 top-third 1974,1998,2012 2 52.6 49.4 3.2 115 15 1926,1960 1921,1945 1975 1946 top-third 3 49.9 45.1 4.8 124 6 1895 2012 1975 1945 top-tenth 4 45.4 42.5 2.9 113 17 1940 2023 1975 1974 top-third 1932 5 43.8 41.4 2.4 110 19 1904 2012 1975 1974 top-third 1954,2006 6 44.7 42.1 2.6 116 13 1904 2012 1975 1974 top-tenth 2022 7 46.7 44.1 2.6 116 13 1904,1918 2017 1975 1974 top-tenth 8 49.1 47.0 2.1 113 16 1918 2017 1975 1974 top-third 1913 9 51.9 49.9 2.0 113 16 1918 2017 1975 1974 top-third 1921 10 54.1 52.4 1.7 112 17 1918 2017 1975 1974 top-third 11 55.6 54.1 1.5 111 18 1918 2017 1975 1974 top-third 1922,1949,2011 12 56.4 54.8 1.6 110 19 1918 2017 1975 1974 top-third 2000 18 51.7 50.6 1.1 101 27 1905 2017 1975 1974 top-third 24 55.2 54.8 0.4 77 51 1905 2017 1973 1975 normal 1914,1951,1957,1990 36 55.7 54.8 0.9 102 25 1970 2021 1975 1955 top-third 1939,1991,1999,2004 48 55.4 54.8 0.6 86 40 1970 2020,2022,2023 1975 1974 top-third 1932,1951,1974,2004 60 55.4 54.8 0.6 84 41 1970 2020 1975 1957 top-third 1949,1952,1999