1901-2000 Degrees Fahrenheit 1 29.4 32.7 -3.3 26 104 1978 2017 1968 1976 bottom-third 1908 2 22.8 31.6 -8.8 2 128 1978 1932 1977 1976 bottom-tenth 3 24.5 32.1 -7.6 1 128 1977 1932 1977 1976 lowest 4 27.1 34.6 -7.5 1 128 1977 1932 1977 1976 lowest 5 31.1 38.4 -7.3 1 128 1977 1932 1977 1976 lowest 6 36.1 42.7 -6.6 1 128 1977 1932 1977 1976 lowest 7 40.5 46.7 -6.2 1 128 1977 1932 1977 1976 lowest 8 44.1 49.8 -5.7 1 128 1977 1932 1977 1976 lowest 9 46.8 51.9 -5.1 1 128 1977 1932 1977 1976 lowest 10 47.8 52.7 -4.9 1 128 1977 1932 1977 1976 lowest 11 48.1 52.5 -4.4 1 128 1977 1932 1977 1976 lowest 12 48.0 51.6 -3.6 1 128 1977 2017 1977 1976 lowest 18 46.7 48.6 -1.9 5 123 1978 2017 1968 1976 bottom-tenth 1968 24 50.1 51.6 -1.5 6 122 1978 2017 1968 1976 bottom-tenth 36 50.5 51.6 -1.1 10 117 1979 2018 1970 1976 bottom-tenth 1919,1982 48 51.3 51.6 -0.3 32 94 1980 2020 1973 1976 bottom-third 1904,1907,1930 60 51.2 51.6 -0.4 28 97 1981 2020 1973 1976 bottom-third 1928,1961,1978