1991-2020 Degrees Fahrenheit 1 45.4 44.7 0.7 66 26 1949 1953 1994 1990 top-third 2 46.6 45.0 1.6 79 13 1984 2022 1994 1971 top-third 2000 3 49.4 47.7 1.7 81 11 1977 2022 1994 1950 top-third 1934,2013 4 53.5 52.2 1.3 82 10 1977 2022 1994 1952 top-third 5 57.6 56.8 0.8 77 15 1977 2022 1994 1952 top-third 2002 6 61.6 61.0 0.6 75 17 1977 2022 1994 1952 top-third 7 64.9 64.1 0.8 77 15 1977 2017 1994 1952 top-third 8 67.2 66.3 0.9 78 14 1977 1999 1994 1952 top-third 2000,2013 9 67.7 67.2 0.5 75 16 1977 1999 1994 1952 top-third 2016 10 67.4 67.0 0.4 75 16 1977 2023 1994 1952 top-third 2016 11 66.5 66.1 0.4 76 15 1977 2012 1994 1952 top-third 1952 12 64.8 64.7 0.1 74 17 1977 2012 1994 1952 top-third 2007 18 63.1 63.4 -0.3 63 27 1977 2023 1994 1957 top-third 1956,1957,1997 24 64.0 64.6 -0.6 55 34 1977 2013 1994 1957 normal 36 63.6 64.6 -1.0 49 38 1977 2019 1994 1965 normal 1958,1965 48 63.4 64.5 -1.1 42 43 1977 2020 1994 1966 normal 1941,1949 60 63.5 64.5 -1.0 47 36 1977 2021 1994 1959 normal 1938,1950,1959,1996