1901-2000 Degrees Fahrenheit 1 60.0 59.5 0.5 73 56 1916 2020 1895 1895 normal 1896 2 62.9 64.0 -1.1 24 105 1916,1920 2020 1895 1895 bottom-third 1970 3 66.0 67.3 -1.3 17 112 1900 2020 1895 1895 bottom-third 1957,1972 4 67.6 69.1 -1.5 11 118 1912 2020 1895 1895 bottom-tenth 5 67.8 68.9 -1.1 12 117 1912 2020 1895 1895 bottom-tenth 1909,1919,1982 6 66.7 67.6 -0.9 20 109 1916 2020 1895 1895 bottom-third 1927,1944,1971,1998 7 64.9 65.6 -0.7 30 99 1912 2020 1895 1895 bottom-third 1901,1921 8 62.7 63.5 -0.8 22 107 1912 2014,2015 1895 1895 bottom-third 1900,1919,1955,1998 9 60.9 61.5 -0.6 33 96 1912 2015 1895 1895 bottom-third 1900,1915,1929,1946,1976 10 58.8 59.6 -0.8 24 105 1911,1912 2015 1895 1895 bottom-third 1929,1937,1964,1971 11 -99 58.1 -99 -99 -99 1912 2015 normal 12 -99 57.4 -99 -99 -99 1912 2015 normal 18 -99 60.8 -99 -99 -99 1912 2015 normal 24 -99 57.4 -99 -99 -99 1912,1949 2015 normal 36 -99 57.4 -99 -99 -99 1913 2016 normal 48 -99 57.4 -99 -99 -99 1912,1913 2017 normal 60 -99 57.4 -99 -99 -99 1913 2018 normal