1925-2000 Degrees Fahrenheit 1 19.8 23.3 -3.5 14 85 1985 2016 1972 1974 bottom-third 1937,1952 2 15.2 17.1 -1.9 25 74 1972 2019 1972 1974 bottom-third 1956 3 10.5 13.0 -2.5 21 78 1972 2019 1974 1973 bottom-third 4 6.7 10.3 -3.6 11 88 1971 2016 1974 1973 bottom-third 5 4.9 9.0 -4.1 4 94 1971 2016 1972 1974 bottom-tenth 1966 6 5.4 9.4 -4.0 5 93 1972 2016 1972 1974 bottom-tenth 7 7.7 11.7 -4.0 4 94 1971 2016 1972 1974 bottom-tenth 1976 8 12.3 15.3 -3.0 5 93 1971 2019 1972 1974 bottom-tenth 9 16.7 19.1 -2.4 8 90 1971 2019 1974 1973 bottom-tenth 1933 10 20.2 22.5 -2.3 8 90 1971 2019 1974 1973 bottom-tenth 1933 11 22.7 24.9 -2.2 9 89 1971 2019 1974 1973 bottom-tenth 12 24.1 26.0 -1.9 11 87 1971 2016 1974 1973 bottom-third 18 18.1 20.4 -2.3 7 90 1972 2016 1972 1974 bottom-tenth 24 23.9 26.0 -2.1 5 92 1972 2019 1972 1974 bottom-tenth 1934 36 24.5 26.0 -1.5 9 87 1973 2016 1974 1971 bottom-tenth 1967 48 24.0 25.9 -1.9 2 93 1974 2019 1974 1973 bottom-tenth 60 23.6 25.9 -2.3 1 93 1975 2019 1975 1974 lowest