1901-2000 Degrees Fahrenheit 1 29.25 22.60 6.65 128 1 1909 2015 2014 2015 highest 2 31.61 26.64 4.97 128 1 1976 2015 2014 2015 highest 3 36.19 31.56 4.63 128 1 1976 2015 2014 2015 highest 4 41.08 36.65 4.43 128 1 1976 2015 2014 2015 highest 5 44.88 41.13 3.75 128 1 1976 2015 2014 2015 highest 6 47.71 44.36 3.35 127 2 1976 2021 2014 2015 top-tenth 7 49.33 45.97 3.36 127 2 1976 2021 2014 2015 top-tenth 8 49.31 46.16 3.15 128 1 1976 2015 2014 2015 highest 9 48.34 45.32 3.02 128 1 1917 2015 2014 2015 highest 10 46.81 43.79 3.02 128 1 1917 2015 2014 2015 highest 11 44.52 41.88 2.64 126 3 1917 2016 2014 2012 top-tenth 12 42.71 40.04 2.67 124 5 1917 2016 2014 2012 top-tenth 18 43.82 41.48 2.34 123 5 1917 2016 2014 2012 top-tenth 24 41.72 40.03 1.69 115 13 1917 2017 2014 2013 top-tenth 36 41.38 40.02 1.36 107 20 1918 2017 2011 2014 top-third 48 41.76 40.01 1.75 116 10 1919 2018 2014 2007 top-tenth 60 41.64 40.00 1.64 115 10 1920 2019 2014 2007 top-tenth