1901-2000 Degrees Fahrenheit 1 38.2 42.5 -4.3 22 108 1940 1950 1918 1923 bottom-third 2 44.7 43.2 1.5 80 49 1977 1932 1921 1923 normal 1943 3 46.1 45.9 0.2 64 65 1977 1932 1921 1923 normal 4 50.0 49.9 0.1 62 67 1977 1932 1921 1923 normal 1903 5 54.9 54.5 0.4 72 57 1977 1932 1921 1923 normal 1992 6 58.8 58.5 0.3 64 65 1977 2017 1921 1923 normal 1933,1965 7 61.6 61.4 0.2 66 63 1977 2017 1921 1923 normal 2009 8 63.5 63.2 0.3 71 58 1977 2017 1921 1923 normal 1917,1919,1960,2015 9 64.0 63.8 0.2 61 68 1977 2017 1921 1923 normal 1925,1944,1988 10 63.7 63.6 0.1 60 69 1977 2017 1921 1923 normal 1929,1944,1986,2003 11 62.8 62.6 0.2 60 69 1977 2017 1921 1923 normal 1913,1929,1936,1965,1983,1989,2003 12 61.2 61.1 0.1 53 76 1977 2017 1921 1923 normal 1930,1931,1943,1988,1989,1996,2003,2015 18 61.4 60.2 1.2 106 22 1977 2017 1921 1923 top-third 1950,2007 24 62.6 61.1 1.5 118 10 1970,1977 2017 1922 1923 top-tenth 1992,2022,2023 36 63.1 61.1 2.0 121 6 1970 2019 1923 1924 top-tenth 2017 48 62.4 61.1 1.3 117 9 1970 2020 1922 1923 top-tenth 1929 60 62.4 61.1 1.3 116 9 1970 2020,2021 1922 1923 top-tenth