1901-2000 Degrees Fahrenheit 1 51.3 54.6 -3.3 15 114 1976 1927 1959 1960 bottom-third 1936 2 58.5 60.4 -1.9 19 110 1976 2016 1959 1960 bottom-third 1907 3 64.0 65.5 -1.5 19 110 1976 1931 1959 1960 bottom-third 1972 4 67.9 69.6 -1.7 9 120 1976 2016 1957 1960 bottom-tenth 1972 5 70.2 72.1 -1.9 5 124 1976 2011 1906 1960 bottom-tenth 6 71.5 73.4 -1.9 6 123 1976 2011 1906 1960 bottom-tenth 7 71.7 73.3 -1.6 6 123 1976 1998,2011 1906 1960 bottom-tenth 8 70.7 72.2 -1.5 4 125 1976 2011 1906 1960 bottom-tenth 1906 9 69.3 70.4 -1.1 12 117 1976 2011 1957 1960 bottom-tenth 1913,1979 10 67.3 68.3 -1.0 12 117 1895 2011 1959 1960 bottom-tenth 1914,1915,1923,1941,1958,1959,1987 11 65.0 66.3 -1.3 12 117 1895 2011,2012 1940 1960 bottom-tenth 12 63.1 64.6 -1.5 6 122 1903 2011 1915 1960 bottom-tenth 1912,1976 18 66.8 67.6 -0.8 17 111 1976 2012 1960 1960 bottom-third 1912,1919,1924,1960,1987 24 63.6 64.6 -1.0 7 120 1913 2012 1959 1960 bottom-tenth 1914,1959 36 63.5 64.6 -1.1 3 123 1914,1915 2013,2018 1915 1960 bottom-tenth 48 63.6 64.6 -1.0 3 122 1915 2018,2019 1915 1960 bottom-tenth 60 63.8 64.6 -0.8 2 122 1979 2020 1916 1960 bottom-tenth 1906,1916