1991-2020 Degrees Fahrenheit 1 70.3 70.0 0.3 80 42 1931 1997 1972 1974 normal 2 69.9 68.5 1.4 102 19 1958 2023 1974 1948 top-third 1913 3 69.4 67.1 2.3 106 10 1958 2023 1974 1913 top-tenth 4 68.3 67.1 1.2 95 17 1958 2017 1974 1972 top-third 2021 5 68.5 67.9 0.6 89 21 1958 2023 1974 1972 top-third 1948,1999 6 69.4 69.5 -0.1 84 26 1958 2020 1973 1974 top-third 1923 7 71.2 71.3 -0.1 84 25 1958 2020 1973 1974 top-third 2015 8 72.5 72.8 -0.3 84 25 1958 2020 1974 1974 top-third 1974,2006,2013 9 73.4 73.9 -0.5 81 28 1958 2020 1973 1974 top-third 1993,1994 10 74.0 74.7 -0.7 73 36 1958,1977 2020 1973 1974 top-third 1952,2000,2003,2011 11 74.3 75.1 -0.8 71 38 1958,1977 2020 1973 1974 normal 1952,1985,1998,2000 12 74.2 75.0 -0.8 71 37 1977 2020,2023 1974 1974 normal 1912,1974,1998 18 72.7 73.1 -0.4 71 27 1978 2021,2023 1974 1950 top-third 1986,2004 24 74.2 74.9 -0.7 64 32 1978 2021 1974 1950 top-third 1976,1983,1997,2011 36 74.0 74.8 -0.8 48 38 1970,1979 2021,2022,2023 1974 1974 normal 1974,1986,1990 48 74.1 74.7 -0.6 45 33 1970 2023 1974 1951 normal 1988 60 73.9 74.7 -0.8 37 36 1970 2023 1974 1953 normal 1988