1991-2020 Degrees Fahrenheit 1 76.9 75.2 1.7 54 13 1976 1979 1967 1963 top-third 2 79.1 79.6 -0.5 27 40 1976 1977 1967 1965 normal 1965,2022 3 82.5 83.2 -0.7 25 42 1976 1951 1967 1963 normal 1984,1987,1988,2004 4 83.7 84.9 -1.2 15 52 1976 1951 1967 1965 bottom-third 1991 5 84.2 85.5 -1.3 15 52 1976 1951 1967 1965 bottom-third 6 83.7 85.0 -1.3 15 52 1976 1951 1967 1967 bottom-third 1967,1993 7 82.2 83.6 -1.4 12 54 1976 2011 1966 1967 bottom-third 1972,2004 8 79.7 81.7 -2.0 6 60 1976 2011 1966 1967 bottom-tenth 1966,1971 9 76.9 79.4 -2.5 4 61 1987 2000,2011 1968 1967 bottom-tenth 10 74.5 77.1 -2.6 4 61 1987 2000 1966 1967 bottom-tenth 1976 11 72.6 75.2 -2.6 2 63 1987 2000 1968 1967 bottom-tenth 12 72.0 74.2 -2.2 4 61 1987 2000 1968 1967 bottom-tenth 18 75.9 77.8 -1.9 5 60 1977 2000 1968 1967 bottom-tenth 1970 24 73.1 74.2 -1.1 8 55 1988 2000 1966 1967 bottom-third 1965,1974,1978,1979,2015 36 73.0 74.2 -1.2 6 55 1970 2000 1966 1967 bottom-tenth 1966,1976,1979,1989 48 73.0 74.2 -1.2 7 52 1971 1956 1968 1967 bottom-third 1969,1977,1990 60 73.0 74.2 -1.2 5 52 1977,1979 1956 1968 1956 bottom-tenth 1969,1972,1973