1901-2000 Degrees Fahrenheit 1 18.8 27.2 -8.4 3 127 1918 2023 1918 1919 bottom-tenth 2 22.1 29.1 -7.0 2 127 1918 2016 1918 1919 bottom-tenth 3 28.1 33.2 -5.1 5 124 1918 2016 1918 1919 bottom-tenth 4 34.5 37.9 -3.4 6 123 1918 2016 1918 1919 bottom-tenth 5 39.9 42.7 -2.8 6 123 1918 2016 1918 1919 bottom-tenth 6 44.2 47.0 -2.8 5 124 1918 2016 1918 1919 bottom-tenth 7 48.0 50.4 -2.4 5 124 1905,1918 2016 1918 1919 bottom-tenth 8 50.1 52.2 -2.1 6 123 1904 2023 1918 1919 bottom-tenth 9 50.8 52.6 -1.8 7 122 1918 2016,2023 1918 1919 bottom-tenth 1963 10 50.1 51.9 -1.8 7 122 1918 2023 1918 1919 bottom-tenth 1941 11 49.0 50.5 -1.5 9 120 1918 2023 1918 1919 bottom-tenth 1912,1917,1940 12 47.3 48.6 -1.3 16 113 1918 2023 1918 1919 bottom-third 1924 18 47.3 48.0 -0.7 22 106 1905 2013,2017 1919 1916 bottom-third 1911,1915,1957,1968 24 47.8 48.5 -0.7 25 103 1918 2023 1919 1915 bottom-third 1898,1911,1913,1942,1969 36 46.8 48.5 -1.7 6 121 1906 2023 1919 1917 bottom-tenth 48 46.8 48.5 -1.7 5 121 1908 2023 1918 1919 bottom-tenth 1918 60 47.1 48.5 -1.4 7 118 1908 2023 1919 1919 bottom-tenth 1918,1919