1901-2000 Degrees Fahrenheit 1 44.5 38.8 5.7 122 8 1920 1915 1991 1987 top-tenth 2 40.6 34.0 6.6 127 3 1917 1910 1991 1910 top-tenth 3 37.1 30.1 7.0 129 1 1899 1992 1991 1992 highest 4 33.5 27.2 6.3 129 1 1917 1992 1991 1992 highest 5 31.3 25.8 5.5 125 4 1917 1981 1991 1981 top-tenth 6 30.4 26.4 4.0 124 5 1917 1934 1991 1981 top-tenth 7 32.0 28.7 3.3 121 8 1917 1934 1991 1981 top-tenth 8 34.8 31.8 3.0 119 10 1917 1934 1991 1981 top-tenth 2005 9 38.2 35.3 2.9 121 8 1917 1934 1991 1981 top-tenth 1954 10 41.0 38.3 2.7 118 11 1917 1934 1991 1981 top-tenth 11 42.6 40.1 2.5 119 10 1917 1934 1991 1981 top-tenth 12 43.1 40.8 2.3 121 8 1917 1934 1991 1981 top-tenth 1999,2004,2012 18 37.8 36.0 1.8 110 18 1913 1935,2016 1991 1982 top-third 1934,1954,1995 24 42.4 40.7 1.7 106 22 1917 1935 1991 1982 top-third 36 42.3 40.7 1.6 108 19 1918 2017 1991 1936 top-third 2009,2023 48 42.3 40.7 1.6 110 16 1899 2018 1991 1992 top-third 2014 60 42.2 40.7 1.5 109 16 1917 2017 1991 1992 top-third 2001,2021