1925-2000 Degrees Fahrenheit 1 47.6 49.2 -1.6 14 85 1949 2004 1949 1951 bottom-third 1970,1974 2 40.0 43.5 -3.5 3 96 1949 2004 1949 1951 bottom-tenth 3 33.2 36.8 -3.6 5 94 1949 2016 1949 1951 bottom-tenth 4 27.4 30.3 -2.9 9 90 1972 2019 1927 1951 bottom-tenth 5 22.6 25.2 -2.6 12 87 1972 2019 1949 1951 bottom-third 1956 6 18.2 21.3 -3.1 8 91 1971 2016 1925 1951 bottom-tenth 7 16.0 18.8 -2.8 8 90 1971 2016 1949 1951 bottom-tenth 1947,1965,1976 8 16.2 17.9 -1.7 18 80 1972 2016 1951 1950 bottom-third 9 17.1 18.8 -1.7 16 82 1971 2016 1951 1950 bottom-third 1946 10 19.5 21.0 -1.5 15 83 1971 2019 1951 1951 bottom-third 1951 11 22.3 23.6 -1.3 15 83 1971 2019 1949 1951 bottom-third 1954,1959,1962 12 24.9 26.0 -1.1 18 80 1971 2019 1949 1951 bottom-third 1943,1954,1959 18 22.8 24.4 -1.6 14 84 1972 2016 1949 1951 bottom-third 1955 24 25.0 26.0 -1.0 18 79 1972 2019 1950 1951 bottom-third 36 25.4 26.0 -0.6 24 72 1973 2016 1951 1946 bottom-third 1962 48 24.8 25.9 -1.1 9 86 1974 2019 1949 1951 bottom-tenth 1956,1966,1977 60 25.0 25.9 -0.9 12 82 1975 2019 1951 1949 bottom-third 1936,1949,1977