1901-2000 Degrees Fahrenheit 1 45.3 41.1 4.2 109 21 1960 2012 1975 1976 top-third 1948 2 37.4 36.9 0.5 67 63 1947 2012 1975 1976 normal 3 30.3 34.8 -4.5 6 124 1978 2012 1958 1976 bottom-tenth 4 29.7 34.4 -4.7 2 127 1978 2012 1977 1976 bottom-tenth 5 30.7 35.9 -5.2 1 128 1977 2012 1977 1976 lowest 6 33.5 38.8 -5.3 1 128 1977 1932 1977 1976 lowest 7 37.4 42.5 -5.1 1 128 1977 1932 1977 1976 lowest 8 41.1 46.0 -4.9 1 128 1977 2017 1977 1976 lowest 9 44.2 48.9 -4.7 1 128 1977 1932,2017 1977 1976 lowest 10 46.6 50.8 -4.2 1 128 1977 2017 1977 1976 lowest 11 47.6 51.7 -4.1 1 128 1977 1932,2017,2020 1977 1976 lowest 12 47.9 51.6 -3.7 1 128 1977 2020 1977 1976 lowest 18 45.8 47.3 -1.5 11 117 1978 2017 1970 1976 bottom-tenth 1982 24 50.4 51.6 -1.2 9 119 1978 2017 1970 1976 bottom-tenth 1919,1981 36 50.6 51.6 -1.0 12 115 1979 2018 1970 1976 bottom-tenth 1963,1981 48 51.2 51.6 -0.4 26 100 1980 2020 1972 1976 bottom-third 1907,1921,1926,1928,1929,1985 60 51.3 51.6 -0.3 30 95 1981 2020 1973 1976 bottom-third 1930,1961