1925-2000 Degrees Fahrenheit 1 41.7 40.6 1.1 62 37 1992 1995 1975 1974 normal 1950 2 46.7 45.1 1.6 78 21 1992 1977 1975 1974 top-third 1957 3 48.6 47.6 1.0 70 29 1948 2019 1975 1974 top-third 4 48.5 48.0 0.5 56 43 1948 2019 1975 1974 normal 1925,1951,1967,1998 5 46.1 46.0 0.1 46 53 1948 2019 1975 1974 normal 1969 6 42.3 42.2 0.1 44 55 1985 2016 1975 1974 normal 1980,1987,2001 7 37.6 37.7 -0.1 40 59 1971,1972 2019 1975 1974 normal 2006 8 32.4 33.6 -1.2 21 78 1972 2019 1975 1974 bottom-third 1974,1984 9 28.9 30.1 -1.2 21 78 1971 2016 1975 1970 bottom-third 1930,1999 10 25.8 27.5 -1.7 14 84 1971 2016 1975 1974 bottom-third 11 23.7 26.0 -2.3 7 91 1971 2016 1975 1974 bottom-tenth 1949 12 23.7 26.0 -2.3 6 92 1971 2019 1975 1974 bottom-tenth 1949 18 29.4 31.4 -2.0 5 93 1956,1971 2016 1972 1975 bottom-tenth 1966 24 23.5 26.0 -2.5 2 95 1972 2019 1972 1975 bottom-tenth 36 23.9 25.9 -2.0 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 60 23.9 25.9 -2.0 2 92 1975 2019 1975 1974 bottom-tenth