1991-2020 Degrees Fahrenheit 1 60.8 61.4 -0.6 42 34 1965 2022 1986 1981 normal 2 63.2 66.5 -3.3 11 65 1965 2022 1986 1984 bottom-third 3 65.5 68.7 -3.2 9 67 1993 2022 1986 1984 bottom-third 4 66.0 67.7 -1.7 18 58 1993 2021 1986 1984 bottom-third 1984,2018 5 64.7 65.2 -0.5 32 44 1965 2021 1986 1981 normal 1955,1963,1973,1997,2008 6 62.9 62.0 0.9 59 17 1950 2012 1986 1980 top-third 7 59.2 58.5 0.7 59 17 1965 2012 1986 1981 top-third 1961 8 56.1 54.9 1.2 65 11 1965 2012 1986 1977 top-third 2000 9 53.2 51.8 1.4 68 8 1950 2012 1986 1981 top-tenth 1988 10 51.1 49.3 1.8 65 10 1950 2012 1986 1981 top-third 11 49.3 48.1 1.2 62 13 1965 2012 1986 1981 top-third 2007 12 49.3 48.1 1.2 65 10 1965,1979 2012 1986 1981 top-third 1992,2022 18 52.8 52.7 0.1 53 22 1951 2016 1986 1981 top-third 1980,2003,2020 24 47.8 48.1 -0.3 46 28 1979 2016 1986 1981 normal 1962,2014 36 46.7 48.1 -1.4 18 55 1951 2017 1986 1985 bottom-third 1958,1985,2020 48 46.8 48.2 -1.4 20 52 1952 2015 1986 1984 bottom-third 1957,1958,1959,1982,1997 60 47.1 48.2 -1.1 24 47 1953 2016 1986 1985 normal 1958,1983,1985