1901-2000 Degrees Fahrenheit 1 31.3 38.3 -7.0 2 128 1917 1934 1897 1896 bottom-tenth 2 32.0 36.2 -4.2 7 123 1917 2015 1897 1896 bottom-tenth 3 31.4 34.2 -2.8 13 117 1922 2015 1895 1896 bottom-tenth 4 32.4 33.6 -1.2 28 101 1949 1934 1897 1896 bottom-third 1911,1942 5 32.4 34.4 -2.0 17 112 1917 1934 1897 1896 bottom-third 1903,1993,2023 6 35.0 36.7 -1.7 19 110 1917 2015 1897 1896 bottom-third 1903 7 37.7 39.6 -1.9 12 117 1917 2015 1897 1896 bottom-tenth 1906,1952 8 40.9 42.7 -1.8 10 119 1917 2015 1897 1896 bottom-tenth 1899,1903,1932,1933,1952,1955 9 43.8 45.1 -1.3 17 112 1917 2015 1897 1896 bottom-third 1901,1904,1906,1932 10 45.1 46.3 -1.2 18 111 1917 2015 1896 1896 bottom-third 1896,1898 11 45.1 46.7 -1.6 11 118 1917 2015 1897 1896 bottom-tenth 1979 12 44.6 46.5 -1.9 6 123 1917 2015 1897 1896 bottom-tenth 1985 18 41.9 43.2 -1.3 13 115 1917 2016 1897 1897 bottom-tenth 1899,1904,1910 24 45.0 46.5 -1.5 7 121 1913,1917 2016 1897 1897 bottom-tenth 1914,1918,1949 36 -99 46.5 -99 -99 -99 1913 2016 normal 48 -99 46.4 -99 -99 -99 1913 2016,2018 normal 60 -99 46.4 -99 -99 -99 1917 2018 normal