1901-2000 Degrees Fahrenheit 1 50.0 46.0 4.0 121 9 1943 2010 1975 1945 top-tenth 2 43.9 40.7 3.2 112 18 1916 1945,2012 1975 1973 top-third 1942 3 40.1 35.9 4.2 120 10 1916 2012 1975 1945 top-tenth 4 35.4 33.3 2.1 102 28 1904 2012 1975 1973 top-third 1945,2022 5 34.2 32.5 1.7 94 35 1904 2012 1975 1974 top-third 1957 6 36.1 33.8 2.3 104 25 1904 2012 1975 1954 top-third 2013 7 38.6 36.2 2.4 104 25 1904,1918 2012 1975 1954 top-third 1913 8 41.1 39.4 1.7 101 28 1918 2012 1975 1954 top-third 1951,1985 9 44.2 42.6 1.6 100 29 1904 2012 1975 1974 top-third 1960,1997 10 47.0 45.4 1.6 100 29 1904 2012 1975 1974 top-third 1960 11 48.6 47.3 1.3 99 30 1904 2012 1975 1974 top-third 1960 12 49.6 48.1 1.5 102 27 1904 2012 1975 1954 top-third 18 44.7 43.3 1.4 99 29 1905 2017 1975 1974 top-third 1932,2009 24 48.8 48.0 0.8 87 41 1905 2017 1975 1974 top-third 1938,1952 36 49.0 48.0 1.0 91 36 1906 2023 1975 1955 top-third 1952 48 48.9 48.0 0.9 89 37 1907 2023 1975 1956 top-third 1995,1997 60 48.8 48.0 0.8 87 38 1908 2023 1975 1957 top-third 1952,1996