1991-2020 Degrees Fahrenheit 1 52.4 56.1 -3.7 13 72 1940 2017 1982 1981 bottom-third 2 49.2 50.8 -1.6 36 49 1940 2012 1982 1981 normal 1988 3 44.6 46.4 -1.8 35 50 1940 2012 1982 1981 normal 4 42.3 43.6 -1.3 42 43 1940 2023 1982 1976 normal 5 42.4 42.9 -0.5 55 30 1940 2012 1982 1976 normal 6 43.5 43.7 -0.2 57 27 1940 2012 1982 1976 top-third 1990 7 45.4 45.8 -0.4 52 32 1940 2012 1982 1976 normal 2018 8 48.2 48.9 -0.7 51 33 1940 2012 1982 1976 normal 1946,1950,1997 9 51.1 52.0 -0.9 41 43 1977 2017 1982 1976 normal 1973,1986,1997,2009 10 53.7 54.7 -1.0 44 40 1977 2017 1982 1976 normal 1946,1986 11 55.2 56.5 -1.3 34 49 1977 2012 1982 1976 normal 1955,1986,1994 12 56.2 57.3 -1.1 41 42 1977 2012 1982 1976 normal 1946,1957 18 50.8 52.7 -1.9 21 61 1941 2017 1982 1981 bottom-third 1948,2004 24 55.2 57.2 -2.0 11 70 1978 2017 1982 1981 bottom-third 1959,1967 36 55.4 57.2 -1.8 15 64 1979 2013 1982 1981 bottom-third 1943,1961,1981 48 55.4 57.2 -1.8 15 62 1964,1980 2023 1982 1977 bottom-third 1961,1984 60 55.3 57.1 -1.8 13 62 1965 2023 1982 1978 bottom-third 1971