1901-2000 Degrees Fahrenheit 1 21.4 28.3 -6.9 8 122 1899 2012 1932 1942 bottom-tenth 1926,2014 2 19.0 22.4 -3.4 23 107 1899 2012 1936 1942 bottom-third 3 15.7 19.0 -3.3 20 110 1912 2012 1937 1942 bottom-third 1937,1994 4 15.3 18.9 -3.6 15 114 1899 2012 1936 1942 bottom-third 1963 5 18.5 21.4 -2.9 15 114 1912 2012 1936 1942 bottom-third 6 23.3 25.6 -2.3 16 113 1912 2012 1937 1942 bottom-third 1937,1959 7 27.9 30.3 -2.4 14 115 1912 2012 1936 1942 bottom-third 1965,1994 8 32.7 34.8 -2.1 14 115 1912 2012 1936 1942 bottom-third 9 36.6 38.6 -2.0 13 116 1904,1912 2012 1936 1942 bottom-tenth 1905 10 39.3 41.1 -1.8 17 112 1904 2012 1936 1942 bottom-third 1920,1970,1994 11 40.6 42.4 -1.8 14 115 1904 2012 1936 1942 bottom-third 1905,1925,1926 12 41.3 42.4 -1.1 24 105 1918 2012 1936 1942 bottom-third 1926,1962,1996 18 37.1 36.8 0.3 70 58 1918 2017 1941 1942 normal 1907,1935,1965 24 43.3 42.4 0.9 99 29 1918 2017 1941 1942 top-third 1945,1987,1990,2020 36 42.9 42.3 0.6 82 45 1918 2000 1941 1942 normal 1935 48 42.9 42.3 0.6 82 44 1918 2002 1941 1942 normal 1944,1957 60 43.0 42.3 0.7 88 37 1920,1929 2002 1941 1942 top-third 1933,1946,1957,1995