Contiguous U.S., Average Temperature Rankings, December 1918 1901-2000 Degrees Fahrenheit 1 34.45 32.68 1.77 89 40 1983 2021 1917 1907 top-third 2 37.48 37.19 0.29 60 69 2000 2021 1917 1915 normal 3 43.71 42.83 0.88 92 37 1898 2021 1917 1915 top-third 1940,1950 4 48.26 48.34 -0.08 50 79 1976 2021 1917 1915 normal 5 53.11 53.09 0.02 59 70 1976 2021 1917 1915 normal 6 56.33 56.51 -0.18 47 82 1976 2021 1917 1913 normal 7 58.45 58.22 0.23 70 59 1976 2021 1917 1901 normal 8 58.74 58.47 0.27 72 57 1976 2021 1917 1901 normal 9 57.66 57.64 0.02 58 71 1917 2021 1917 1913 normal 10 56.47 56.03 0.44 80 49 1917 2012 1917 1910 normal 1980 11 54.41 54.01 0.40 81 48 1917 2012 1917 1910 normal 1936 12 51.87 52.02 -0.15 50 79 1917 2012 1917 1911 normal 1901,1961 18 53.10 53.52 -0.42 25 103 1917 2012,2016 1917 1914 bottom-third 1906,1972 24 50.97 52.02 -1.05 5 123 1917 2017 1917 1916 bottom-tenth 36 50.93 52.01 -1.08 2 125 1917 2017 1917 1916 bottom-tenth 1905 48 51.06 52.00 -0.94 2 124 1917 2018 1917 1916 bottom-tenth 60 51.21 51.99 -0.78 6 119 1920 2019,2020 1917 1915 bottom-tenth