1901-2000 Degrees Fahrenheit 1 61.4 64.1 -2.7 18 111 1911 1971,2003 1944 1950 bottom-third 1908,1924,1944,1992 2 63.4 64.9 -1.5 23 106 1993 2003 1950 1949 bottom-third 1972 3 59.7 62.7 -3.0 5 124 1993 1936 1915 1950 bottom-tenth 4 57.5 59.6 -2.1 11 118 1907 1936 1950 1949 bottom-tenth 5 53.5 55.8 -2.3 6 123 1907 1936,1988 1950 1949 bottom-tenth 1968 6 47.7 51.4 -3.7 2 127 1899 1988 1899 1950 bottom-tenth 7 43.8 47.1 -3.3 4 125 1899 2016 1917 1950 bottom-tenth 8 40.0 43.3 -3.3 6 123 1899 1934 1950 1949 bottom-tenth 9 38.3 40.8 -2.5 9 119 1899 2012 1950 1949 bottom-tenth 1922,1949,1993 10 37.0 39.7 -2.7 8 120 1899 2000 1950 1949 bottom-tenth 1916 11 37.8 40.0 -2.2 9 119 1899 2000,2016 1950 1949 bottom-tenth 1916,1969 12 39.0 41.1 -2.1 10 118 1899 2016 1950 1949 bottom-tenth 1922 18 42.0 44.6 -2.6 4 124 1899 2016 1917 1950 bottom-tenth 24 38.6 41.1 -2.5 3 124 1917 2016 1917 1950 bottom-tenth 36 38.9 41.1 -2.2 3 123 1899,1952 2017 1899 1950 bottom-tenth 48 39.5 41.1 -1.6 3 122 1952 2017,2018 1918 1950 bottom-tenth 1918 60 39.6 41.1 -1.5 2 122 1952 2016 1917 1950 bottom-tenth 1917