1991-2020 Degrees Fahrenheit 1 90.3 88.7 1.6 53 15 1965 2021 2011 2013 top-third 2 85.9 84.3 1.6 58 10 1965 2001,2006 2011 2013 top-third 1958 3 81.9 80.3 1.6 59 9 1967,1975 2000 2011 2013 top-third 4 78.6 76.8 1.8 63 5 1975 2004 2012 2013 top-tenth 2000 5 75.8 73.5 2.3 67 1 1975 2014,2015,2016,2017 2013 2014 highest 2015,2016,2017 6 73.2 70.8 2.4 65 1 1975 2014 2013 2014 highest 7 70.6 68.7 1.9 60 2 1975 2015 2013 2014 top-tenth 8 69.9 68.1 1.8 59 3 1975 1996 2013 1996 top-tenth 2018 9 70.2 69.1 1.1 55 6 1975 1996,2015 2013 2000 top-tenth 2016,2022 10 71.9 71.0 0.9 52 9 1973 1996 2013 2004 top-third 11 73.8 73.1 0.7 50 11 1973 1996 2013 2013 top-third 2013 12 75.6 74.9 0.7 50 11 1975 1996 2013 2012 top-third 18 74.1 73.5 0.6 50 10 1976 2015 2012 2013 top-third 2004 24 75.5 74.9 0.6 48 8 1973,1975,1976 2018 2012 2013 top-third 36 75.6 74.9 0.7 46 5 1975,1977 2017,2018 2013 2014 top-tenth 2019,2022 48 75.2 74.9 0.3 38 8 1975,1976 2018 2007 2014 top-third 2022 60 -99 74.8 -99 -99 -99 1977 2018 normal