1901-2000 Degrees Fahrenheit 1 48.2 53.9 -5.7 6 123 1960 2012 1960 1968 bottom-tenth 2 45.8 50.4 -4.6 7 122 1960 2012 1960 1968 bottom-tenth 1915 3 44.3 48.4 -4.1 9 120 1958 1990 1968 1967 bottom-tenth 4 43.7 47.7 -4.0 3 125 1978 2012 1958 1968 bottom-tenth 5 45.4 48.8 -3.4 4 124 1902,1940,1977 1932 1940 1968 bottom-tenth 6 48.4 51.2 -2.8 7 121 1977 1932 1958 1968 bottom-tenth 1931,1940 7 51.9 54.4 -2.5 7 121 1977 1932 1968 1967 bottom-tenth 1915,1964 8 55.5 57.5 -2.0 12 116 1977 2017 1968 1967 bottom-tenth 9 58.1 60.0 -1.9 11 117 1977 2017 1968 1967 bottom-tenth 10 59.9 61.7 -1.8 8 120 1977 2017 1968 1967 bottom-tenth 1905 11 60.6 62.5 -1.9 5 123 1977 2017 1968 1967 bottom-tenth 1904,1958 12 60.8 62.4 -1.6 7 121 1977 2017 1968 1967 bottom-tenth 1964 18 56.8 58.7 -1.9 2 125 1905 2017 1941 1968 bottom-tenth 1941,1970,1978 24 60.4 62.4 -2.0 1 126 1969 2017 1969 1968 lowest 36 60.8 62.4 -1.6 2 124 1970 2018 1969 1968 bottom-tenth 48 61.0 62.4 -1.4 2 123 1970 2020 1969 1968 bottom-tenth 60 61.2 62.4 -1.2 3 121 1970 2020 1968 1968 bottom-tenth 1968