1901-2000 Degrees Fahrenheit 1 15.9 13.2 2.7 91 39 1920 2023 1914 1913 top-third 2011 2 15.7 15.9 -0.2 56 73 1918 2023 1914 1913 normal 1978,2018 3 19.9 21.4 -1.5 30 99 1918 2023 1912 1914 bottom-third 1917 4 26.4 27.1 -0.7 42 87 1918 2023 1912 1914 bottom-third 1944,1987 5 32.2 32.7 -0.5 41 88 1905 2023 1912 1914 bottom-third 1899,1963,1976 6 37.1 37.7 -0.6 36 93 1905 2023 1912 1914 bottom-third 1940 7 40.7 41.7 -1.0 27 102 1905 2023 1912 1914 bottom-third 1973 8 42.7 43.9 -1.2 22 107 1905 2023 1911 1914 bottom-third 9 43.8 44.7 -0.9 26 103 1918 2023 1911 1914 bottom-third 10 42.8 44.0 -1.2 16 113 1918 2023 1908 1914 bottom-third 1897 11 41.2 42.4 -1.2 17 112 1918 2023 1908 1914 bottom-third 1941 12 38.2 40.1 -1.9 8 121 1918 2023 1908 1914 bottom-tenth 18 38.3 39.3 -1.0 17 111 1905 2017,2023 1912 1914 bottom-third 1923,1925,1936 24 39.1 40.1 -1.0 18 110 1905,1918 2023 1909 1914 bottom-third 1904,1920 36 39.4 40.0 -0.6 21 106 1907 2023 1913 1914 bottom-third 1912,1913,1917 48 39.2 40.0 -0.8 18 108 1908 2013,2014 1910 1914 bottom-third 1899 60 39.3 40.0 -0.7 19 106 1908 2014,2023 1912 1914 bottom-third 1900,1901,1931