1901-2000 Degrees Fahrenheit 1 51.6 57.1 -5.5 7 123 1960 2012 1914 1913 bottom-tenth 2 49.4 53.8 -4.4 13 117 1941 2023 1912 1913 bottom-tenth 3 48.9 51.8 -2.9 26 104 1978 2023 1912 1913 bottom-third 1906 4 48.9 51.1 -2.2 27 102 1978 2017 1912 1913 bottom-third 1968,2011 5 50.5 52.0 -1.5 31 98 1902 2017 1912 1913 bottom-third 1924,1936,1966 6 52.5 54.3 -1.8 24 105 1977 2017 1912 1913 bottom-third 1912,1941 7 55.4 57.4 -2.0 16 113 1977 2017 1905 1913 bottom-third 1896,1918,1931 8 58.6 60.2 -1.6 19 110 1977 2017 1905 1913 bottom-third 9 61.2 62.5 -1.3 22 107 1977 2017 1906 1913 bottom-third 1906 10 62.9 64.1 -1.2 22 107 1977 2017 1905 1913 bottom-third 1900 11 63.9 64.8 -0.9 25 104 1977 2017 1908 1913 bottom-third 1931,1960,1966 12 63.9 64.8 -0.9 23 106 1977 2017 1908 1913 bottom-third 1915,1960 18 60.9 61.3 -0.4 41 87 1978 2017 1906 1913 bottom-third 1942,2004 24 64.6 64.8 -0.2 46 82 1978 2017 1909 1913 normal 1909,1976,1993,1995,1996 36 64.6 64.8 -0.2 46 81 1970 2018 1912 1913 normal 1910,1912 48 64.6 64.8 -0.2 38 88 1905,1970,1971 2020 1908 1913 bottom-third 1900,1944,1960,1986,1995,2004,2011 60 64.6 64.8 -0.2 37 88 1970 2020 1912 1913 bottom-third 1901,1909,1912,1918,1941,1961