1901-2000 Degrees Fahrenheit 1 41.0 45.0 -4.0 18 111 1963 2015 1963 1967 bottom-third 2 45.2 48.5 -3.3 9 120 1950,1976 2015 1963 1967 bottom-tenth 1989 3 50.9 53.2 -2.3 11 118 1976 1931 1963 1967 bottom-tenth 1937 4 56.0 58.4 -2.4 9 120 1976 1931 1967 1967 bottom-tenth 1967 5 60.5 62.5 -2.0 11 118 1976 1931 1967 1966 bottom-tenth 6 63.4 65.3 -1.9 8 121 1976 2016 1967 1966 bottom-tenth 1989 7 65.3 67.0 -1.7 9 120 1976 2016 1967 1966 bottom-tenth 1966 8 65.7 67.3 -1.6 11 118 1976 2016 1967 1965 bottom-tenth 9 65.3 66.7 -1.4 15 114 1976 2015,2016 1967 1965 bottom-third 10 63.8 65.4 -1.6 8 121 1976 1921 1966 1967 bottom-tenth 1966 11 61.5 63.7 -2.2 2 127 1976 1921,1927 1901 1967 bottom-tenth 1901 12 59.8 62.0 -2.2 2 127 1976 1921,1927 1968 1967 bottom-tenth 18 60.6 63.1 -2.5 1 127 1968 1922 1968 1967 lowest 24 60.1 62.0 -1.9 2 126 1969 1922 1968 1967 bottom-tenth 36 60.2 62.0 -1.8 2 125 1969 1923 1968 1967 bottom-tenth 48 60.5 62.0 -1.5 3 123 1969 2019 1968 1967 bottom-tenth 1971,1979 60 60.7 62.0 -1.3 4 121 1970 2019,2020 1967 1967 bottom-tenth 1967,1980