1991-2020 Degrees Fahrenheit 1 47.0 45.4 1.6 74 20 1983 2021 2013 2014 top-third 1955 2 50.5 49.3 1.2 77 17 1932 2021 2014 2012 top-third 1949,2019 3 55.9 54.7 1.2 79 15 1932 2021 2014 2012 top-third 4 61.7 59.9 1.8 88 6 1932 2021 2014 1998 top-tenth 5 66.1 64.4 1.7 87 7 1976 2021 2014 1998 top-tenth 6 69.1 67.5 1.6 87 7 1976 2021 2014 1998 top-tenth 7 70.5 69.5 1.0 81 13 1976 2021 2014 2012 top-third 8 70.5 70.1 0.4 76 17 1976 1998 2014 2012 top-third 1994,1999 9 69.9 69.6 0.3 77 16 1976 2022 2014 2012 top-third 1977,1999 10 68.3 68.3 0.0 72 21 1976 2011 2013 2014 top-third 1948,1953 11 66.3 66.6 -0.3 70 23 1976 2011 2013 2014 top-third 1948,1951,1953,1996 12 64.2 64.8 -0.6 62 29 1976 2017 2013 2014 top-third 1977,2005 18 65.4 65.6 -0.2 69 22 1976 2017 2014 2013 top-third 1953,1995,1996 24 64.4 64.7 -0.3 67 22 1976 2017 2014 2013 top-third 1951,1955,1995,1998,2009 36 64.3 64.7 -0.4 60 27 1976 2018 2010 2014 top-third 1952,1956 48 64.8 64.6 0.2 71 14 1976 2019,2020 2011 2014 top-third 1999,2006,2016 60 65.1 64.6 0.5 74 9 1976 2020 2014 2014 top-third 2001,2012,2013,2014,2016