1991-2020 Degrees Fahrenheit 1 42.7 44.7 -2.0 84 40 1917 2017 1981 1978 top-third 2 37.0 39.9 -2.9 70 54 1933 2017 1979 1981 normal 1906,1936,1938,1943,1947,1987 3 32.2 35.7 -3.5 64 60 1917 2017 1979 1981 normal 1904,1909 4 31.1 33.8 -2.7 65 58 1917 2015 1979 1981 normal 1936 5 32.7 34.9 -2.2 71 52 1917 2017 1980 1981 normal 1985 6 35.3 37.9 -2.6 62 61 1917 2017 1979 1981 normal 7 39.8 42.0 -2.2 65 58 1917 2017 1979 1981 normal 1987 8 44.1 46.2 -2.1 65 58 1917 2017 1979 1981 normal 9 47.7 49.9 -2.2 69 54 1917 2017 1979 1981 normal 1953,1966,1987 10 50.4 52.1 -1.7 75 48 1917 2017 1979 1981 normal 1943 11 51.1 53.0 -1.9 74 49 1917 2017 1979 1981 normal 1972,1987,1994 12 51.4 52.9 -1.5 80 43 1913 2017 1979 1981 normal 1911,1938,1983 18 47.6 47.9 -0.3 99 23 1913 2018 1981 1935 top-third 24 52.0 52.9 -0.9 91 31 1913 2018 1980 1981 top-third 36 51.8 52.9 -1.1 93 28 1914 2019 1981 1982 top-third 1983 48 50.9 52.8 -1.9 78 42 1920 2018,2020 1980 1981 normal 60 51.5 52.7 -1.2 88 31 1917 2019,2021 1981 1982 top-third