1901-2000 Degrees Fahrenheit 1 37.7 45.3 -7.6 7 123 1940 1950 1918 1917 bottom-tenth 2 39.2 46.0 -6.8 2 127 1977 1950 1918 1917 bottom-tenth 3 43.2 48.6 -5.4 2 127 1977 1932 1918 1917 bottom-tenth 4 47.0 52.7 -5.7 2 127 1977 1932 1918 1917 bottom-tenth 5 52.5 57.2 -4.7 2 127 1977 1932 1918 1917 bottom-tenth 6 57.0 61.1 -4.1 2 127 1977 1932 1918 1917 bottom-tenth 7 60.4 63.9 -3.5 2 127 1977 1932 1918 1917 bottom-tenth 8 62.9 65.7 -2.8 2 127 1977 1932 1918 1917 bottom-tenth 9 63.3 66.3 -3.0 2 127 1977 1999 1918 1917 bottom-tenth 10 63.4 66.1 -2.7 2 127 1977 1923,1932,1999,2017 1918 1917 bottom-tenth 11 62.8 65.1 -2.3 3 126 1977 2017 1918 1917 bottom-tenth 1970 12 61.6 63.7 -2.1 4 125 1977 2017 1918 1917 bottom-tenth 1969 18 61.7 62.8 -1.1 16 112 1977 1923 1905 1917 bottom-third 1905,1962,1985,2015 24 62.8 63.7 -0.9 16 112 1970,1977 1923 1918 1917 bottom-third 1960,1964,1976,1979 36 63.4 63.7 -0.3 36 91 1970 1934,2019 1906 1917 bottom-third 1903,1905,2011 48 63.3 63.7 -0.4 30 96 1970 2020 1905 1917 bottom-third 1997 60 63.4 63.7 -0.3 34 91 1970,1971,1980,1981 2020 1906 1917 bottom-third