1991-2020 Degrees Fahrenheit 1 19.1 25.3 -6.2 21 101 1918 2006 1984 1983 bottom-third 2 26.5 28.0 -1.5 54 66 1918 1932 1984 1983 normal 1955 3 31.2 32.3 -1.1 57 62 1977 1932 1984 1983 normal 1964 4 37.5 37.5 0.0 72 46 1977 1932 1984 1983 normal 1916 5 42.7 43.0 -0.3 72 46 1977 1932 1984 1983 normal 1907,1919,2019 6 47.9 47.8 0.1 75 43 1977 1932 1984 1983 normal 1964 7 51.2 51.5 -0.3 69 49 1977 1932 1984 1983 normal 1967 8 53.8 53.8 0.0 80 38 1977 1932 1984 1983 top-third 1953,1983,1988 9 54.0 54.5 -0.5 68 50 1918 1932 1984 1983 normal 1915,1949 10 53.3 54.0 -0.7 62 55 1918 1932 1984 1983 normal 1906,1915,2003 11 51.2 52.5 -1.3 40 77 1918 2013 1982 1984 normal 1913,1924,1971,1980 12 49.8 50.5 -0.7 69 47 1918 2013 1984 1984 normal 1901,1921,1933,1949,1965,1984,1986,2001 18 48.6 49.6 -1.0 48 62 1918 2017 1983 1984 normal 1902,1931,1957,1973,1976,2009,2014 24 49.8 50.5 -0.7 67 41 1918 2013 1984 1984 normal 1974,1984,1986,2005,2016 36 49.8 50.5 -0.7 58 43 1918 2013,2018 1984 1976 normal 1954,1975,1986 48 49.5 50.4 -0.9 47 49 1918 2019,2020 1984 1976 normal 1902 60 49.3 50.4 -1.1 38 53 1981 2021 1984 1978 normal 1955