1901-2000 Degrees Fahrenheit 1 29.9 29.0 0.9 69 61 1978 2017 1917 1915 normal 1928 2 21.5 28.0 -6.5 11 119 1978 2023 1912 1917 bottom-tenth 3 21.0 28.8 -7.8 3 126 1977 1932 1918 1917 bottom-tenth 4 25.0 31.8 -6.8 2 127 1977 1932 1918 1917 bottom-tenth 5 29.1 36.0 -6.9 2 127 1977 1932 1918 1917 bottom-tenth 6 34.4 40.8 -6.4 2 127 1977 1932 1918 1917 bottom-tenth 7 39.6 45.1 -5.5 2 127 1977 1932 1918 1917 bottom-tenth 8 43.6 48.6 -5.0 2 127 1977 1932 1918 1917 bottom-tenth 9 46.1 50.8 -4.7 2 127 1977 1932 1918 1917 bottom-tenth 10 46.8 51.8 -5.0 1 128 1918 1932 1918 1917 lowest 11 46.9 51.5 -4.6 1 128 1918 1932 1918 1917 lowest 12 46.2 50.4 -4.2 1 128 1918 2017 1918 1917 lowest 18 43.8 47.2 -3.4 1 127 1918 2017 1918 1917 lowest 24 47.7 50.4 -2.7 1 127 1918 2017 1918 1917 lowest 36 48.4 50.4 -2.0 1 126 1918 2018 1918 1917 lowest 48 48.9 50.4 -1.5 2 124 1980 2019,2020 1918 1917 bottom-tenth 60 49.3 50.4 -1.1 2 123 1981 2020 1918 1917 bottom-tenth 1980