1901-2000 Degrees Fahrenheit 1 45.2 49.5 -4.3 7 122 1976 1985 1951 1966 bottom-tenth 1997 2 51.8 55.0 -3.2 5 124 1976 1919 1952 1966 bottom-tenth 3 56.5 60.5 -4.0 2 127 1976 1931 1967 1966 bottom-tenth 4 60.5 64.7 -4.2 2 127 1976 2016 1967 1966 bottom-tenth 5 62.9 67.3 -4.4 2 127 1976 2016 1967 1966 bottom-tenth 6 64.6 68.5 -3.9 2 127 1976 2016 1967 1966 bottom-tenth 7 64.7 68.4 -3.7 2 127 1976 2016 1967 1966 bottom-tenth 8 64.5 67.3 -2.8 3 126 1976 2016 1967 1966 bottom-tenth 9 63.4 65.4 -2.0 2 127 1976 2016 1967 1966 bottom-tenth 1997 10 60.9 63.2 -2.3 1 128 1967 2016 1967 1966 lowest 11 59.1 61.0 -1.9 3 126 1940 1921 1958 1966 bottom-tenth 1958 12 57.6 59.4 -1.8 4 124 1940 2016 1940 1966 bottom-tenth 1969 18 60.8 62.5 -1.7 4 124 1968 2016 1967 1966 bottom-tenth 24 57.8 59.4 -1.6 1 126 1967,1970 2017 1967 1966 lowest 1970 36 58.3 59.4 -1.1 6 120 1969 2018 1967 1966 bottom-tenth 1979,1980 48 58.2 59.4 -1.2 5 120 1969,1970 2019 1967 1966 bottom-tenth 60 58.2 59.4 -1.2 4 120 1970 2020 1967 1966 bottom-tenth 1968,1980