1901-2000 Degrees Fahrenheit 1 64.7 65.3 -0.6 51 78 1993 2007 1918 1919 normal 2 60.4 61.5 -1.1 31 98 1915 2021 1915 1919 bottom-third 1897,1975 3 56.0 57.1 -1.1 30 99 1915 1936 1917 1919 bottom-third 1928,1929,2011 4 49.8 52.5 -2.7 6 123 1950 1988 1917 1919 bottom-tenth 5 45.1 47.9 -2.8 5 124 1917 2012 1917 1919 bottom-tenth 1906 6 41.3 43.6 -2.3 10 119 1899,1917 1934 1917 1919 bottom-tenth 7 38.6 40.0 -1.4 25 104 1917 1934 1917 1919 bottom-third 1932 8 35.6 37.6 -2.0 13 115 1917 1934 1917 1919 bottom-tenth 1950,1975 9 34.2 36.6 -2.4 7 121 1917 1934 1917 1919 bottom-tenth 1903,1949 10 34.1 37.2 -3.1 4 124 1917 1934 1917 1919 bottom-tenth 11 36.1 38.7 -2.6 5 123 1917 1934 1917 1919 bottom-tenth 12 38.5 40.8 -2.3 6 122 1917 1934 1917 1919 bottom-tenth 1913,1973 18 40.7 41.7 -1.0 21 107 1917 2016 1918 1919 bottom-third 1916,1923 24 40.0 40.7 -0.7 25 102 1913,1917 2016 1918 1919 bottom-third 1907,1949 36 40.3 40.7 -0.4 32 94 1917 2017 1919 1911 bottom-third 1907,1923,1974,1979 48 39.3 40.7 -1.4 4 121 1899 2018 1918 1919 bottom-tenth 1918 60 39.4 40.7 -1.3 3 121 1917 2016 1917 1919 bottom-tenth