1991-2020 Degrees Fahrenheit 1 31.9 29.3 2.6 105 25 1899 1954 1994 1992 top-third 1916 2 30.2 29.1 1.1 104 26 1899 1954 1994 1992 top-third 1991 3 31.1 28.8 2.3 120 9 1899 1934,1981 1994 1992 top-tenth 1935,1983 4 31.9 30.5 1.4 114 14 1899 1934,2000 1994 1992 top-third 2016 5 34.8 33.7 1.1 111 17 1899 1934 1994 1992 top-third 2004,2009 6 39.2 38.0 1.2 114 14 1899 1934 1994 1981 top-third 7 43.5 42.2 1.3 117 11 1899 1934,2022 1994 1981 top-tenth 2015 8 46.5 45.7 0.8 112 16 1899 2022 1994 1981 top-third 2023 9 48.7 47.6 1.1 118 10 1899 2022 1994 1981 top-tenth 1935,2006,2018 10 49.4 48.0 1.4 123 5 1899 2022 1994 1935 top-tenth 2016 11 48.8 47.5 1.3 122 6 1899 2022 1994 1935 top-tenth 12 48.0 46.6 1.4 122 6 1913 2013 1994 1935 top-tenth 1935 18 43.8 43.7 0.1 105 21 1913 1935 1994 1982 top-third 1954 24 46.2 46.6 -0.4 99 27 1914 2017 1994 1982 top-third 1955,2012 36 45.9 46.6 -0.7 95 29 1918 2018 1994 1992 top-third 1941,1955,1991,2010 48 46.0 46.6 -0.6 99 23 1916,1919 2018,2019 1994 1992 top-third 1935,1992,1998,2010 60 45.9 46.5 -0.6 94 26 1917 2019 1994 1993 top-third 1935,1992,1993