1925-2000 Degrees Fahrenheit 1 48.2 49.2 -1.0 21 78 1949 2004 1975 1971 bottom-third 1950 2 42.4 43.5 -1.1 21 78 1949 2004 1975 1974 bottom-third 1948 3 36.0 36.8 -0.8 28 71 1949 2016 1975 1974 bottom-third 1935 4 29.4 30.3 -0.9 32 67 1972 2019 1975 1974 bottom-third 2006 5 22.7 25.2 -2.5 14 85 1972 2019 1974 1975 bottom-third 1937 6 19.1 21.3 -2.2 15 84 1971 2016 1975 1973 bottom-third 1949 7 16.0 18.8 -2.8 8 90 1971 2016 1975 1974 bottom-tenth 1947,1952,1965 8 14.4 17.9 -3.5 4 94 1972 2016 1972 1975 bottom-tenth 1949 9 15.4 18.8 -3.4 5 93 1971 2016 1975 1974 bottom-tenth 10 17.8 21.0 -3.2 5 93 1971 2019 1972 1975 bottom-tenth 11 20.7 23.6 -2.9 5 93 1971 2019 1972 1975 bottom-tenth 12 23.4 26.0 -2.6 5 93 1971 2019 1972 1975 bottom-tenth 18 21.7 24.4 -2.7 3 95 1972 2016 1972 1975 bottom-tenth 24 23.6 26.0 -2.4 2 95 1972 2019 1972 1975 bottom-tenth 1956 36 23.7 26.0 -2.3 2 94 1973 2016 1973 1975 bottom-tenth 1972 48 24.2 25.9 -1.7 3 92 1974 2019 1975 1973 bottom-tenth 1972,1973 60 23.8 25.9 -2.1 2 92 1975 2019 1975 1974 bottom-tenth