1901-2000 Degrees Fahrenheit 1 40.62 38.61 2.01 112 17 1920 1981 2014 2012 top-third 2 36.83 34.30 2.53 121 8 1950 2012 2014 2012 top-tenth 3 31.74 30.47 1.27 97 32 1899 2012 2014 2012 top-third 4 29.53 27.79 1.74 104 25 1912 2012 2014 2012 top-third 5 29.28 26.76 2.52 118 10 1899 2012 2014 2012 top-tenth 6 29.10 27.42 1.68 109 19 1899 2017 2014 2012 top-third 1938,1981 7 31.29 29.42 1.87 114 14 1899 2017 2014 2012 top-third 8 34.15 32.23 1.92 116 12 1917 2016 2014 2012 top-tenth 9 37.05 35.21 1.84 115 13 1917 2017 2014 2012 top-tenth 10 39.42 37.74 1.68 113 15 1917 2017 2014 2012 top-third 11 41.05 39.37 1.68 113 15 1917 2017 2014 2012 top-third 12 41.67 40.04 1.63 113 15 1917 2016 2014 2012 top-third 18 36.57 35.83 0.74 95 32 1918 2017 2014 2013 top-third 1922 24 40.96 40.03 0.93 103 24 1918 2017 2014 2013 top-third 36 41.07 40.02 1.05 104 22 1918 2017 2011 2014 top-third 48 41.49 40.01 1.48 110 15 1918 2019 2014 2008 top-third 60 41.40 40.00 1.40 110 14 1920 2020 2014 2008 top-third