1901-2000 Degrees Fahrenheit 1 62.7 60.3 2.4 102 28 1907 2017 1914 1908 top-third 1957,2010 2 53.0 56.2 -3.2 8 122 1960 2012 1915 1914 bottom-tenth 1969 3 50.5 52.3 -1.8 24 106 1958 2012 1914 1913 bottom-third 4 47.7 49.6 -1.9 27 103 1978 2017 1912 1914 bottom-third 5 46.0 48.3 -2.3 18 111 1978 2012,2017 1905 1914 bottom-third 6 46.6 48.7 -2.1 16 113 1940 2017 1905 1914 bottom-third 1931,1984 7 48.8 50.5 -1.7 19 110 1977 2017 1905 1914 bottom-third 1980,1984 8 51.6 53.3 -1.7 17 112 1977 2017 1905 1914 bottom-third 1984,2010 9 54.4 56.1 -1.7 15 114 1977 2017 1905 1914 bottom-third 2010 10 57.0 58.3 -1.3 17 112 1977 2017 1905 1914 bottom-third 2014 11 59.2 59.9 -0.7 33 96 1977 2017 1906 1914 bottom-third 1906 12 59.9 60.6 -0.7 30 99 1977 2017 1905 1914 bottom-third 1936,1971,1982 18 56.2 56.7 -0.5 32 96 1977 2017 1913 1914 bottom-third 1899,1913,1931,1967,1983 24 60.3 60.6 -0.3 35 93 1978 2017 1906 1914 bottom-third 1900,1948,1958,1996,1997,1998 36 60.4 60.6 -0.2 35 92 1970 2018 1907 1914 bottom-third 1901,1907,1931,1967,1983,1986,2015 48 60.5 60.6 -0.1 40 86 1971 2020 1908 1914 bottom-third 1919,1921 60 60.5 60.6 -0.1 38 87 1971 2020 1908 1914 bottom-third 1943,1996