1901-2000 Degrees Fahrenheit 1 39.88 41.41 -1.53 19 110 1917 1947 1987 2018 bottom-third 2 48.07 46.66 1.41 110 19 1917 2015 2012 2018 top-third 3 52.42 50.79 1.63 112 17 1917 2016 2017 2018 top-third 4 54.85 53.23 1.62 115 14 1976 2021 2017 2018 top-third 5 55.12 53.71 1.41 113 16 1917 2021 2012 2018 top-third 6 53.96 52.66 1.30 112 17 1917 2018 2009 2018 top-third 2005 7 52.08 50.65 1.43 118 11 1917 2015 2014 2018 top-tenth 8 49.22 48.07 1.15 105 24 1917 2016 2014 2018 top-third 9 46.19 45.27 0.92 101 28 1917 2016 2014 2018 top-third 10 43.85 42.71 1.14 103 26 1917 2016 2014 2018 top-third 11 42.25 40.89 1.36 107 21 1917 2016 2014 2018 top-third 12 41.22 40.04 1.18 101 27 1917 2016 2014 2018 top-third 18 46.04 44.25 1.79 119 9 1917 2016 2014 2018 top-tenth 24 41.64 40.04 1.60 113 14 1917,1918 2017 2015 2018 top-third 36 42.07 40.02 2.05 121 5 1918 2017 2016 2018 top-tenth 48 42.41 40.01 2.40 123 2 1918 2018 2017 2018 top-tenth 60 42.36 40.00 2.36 122 2 1920 2020 2018 2019 top-tenth