1991-2020 Degrees Fahrenheit 1 44.5 41.6 2.9 105 11 1958 2012 1934 1921 top-tenth 2 40.2 37.0 3.2 108 7 1912,1960 2017 1934 1935 top-tenth 3 38.3 34.8 3.5 108 5 1912 2012 1934 1935 top-tenth 4 36.4 33.7 2.7 104 8 1912 2000 1933 1934 top-tenth 5 37.6 34.9 2.7 109 3 1912 2000 1933 1934 top-tenth 1999,2012 6 40.9 37.7 3.2 110 2 1912 2000 1934 1935 top-tenth 7 43.9 41.6 2.3 104 6 1912 2016 1933 1934 top-tenth 2006 8 48.1 45.7 2.4 108 2 1912 2016 1934 1935 top-tenth 9 51.8 49.0 2.8 109 1 1912 1935 1934 1935 highest 10 54.1 51.2 2.9 108 1 1912 1935 1934 1935 highest 11 55.3 51.9 3.4 107 1 1912 1935 1934 1935 highest 12 55.1 51.7 3.4 107 1 1912 1935 1934 1935 highest 18 50.2 47.0 3.2 105 1 1916 1935 1934 1935 highest 24 54.3 51.7 2.6 104 1 1917 1935 1934 1935 highest 36 53.1 51.7 1.4 102 1 1918 1935,2017,2018 1934 1935 highest 2017,2018 48 52.5 51.7 0.8 96 5 1918 2018 1934 1935 top-tenth 2002,2016,2019 60 52.2 51.7 0.5 86 13 1925,1931 2006,2017 1934 1935 top-third 1941,2008,2015