1991-2020 Degrees Fahrenheit 1 45.0 44.7 0.3 65 27 1949 1953 2015 2012 top-third 2 46.0 45.0 1.0 73 19 1984 2022 2015 2006 top-third 3 48.7 47.7 1.0 71 21 1977 2022 2015 2013 top-third 2002 4 53.2 52.2 1.0 80 12 1977 2022 2015 2006 top-third 2020 5 58.4 56.8 1.6 84 8 1977 2022 2015 2006 top-tenth 1952,2006 6 62.6 61.0 1.6 85 7 1977 2022 2015 2004 top-tenth 1935,1952 7 65.6 64.1 1.5 80 12 1977 2017 2015 2012 top-third 8 67.3 66.3 1.0 79 13 1977 1999 2015 2012 top-third 9 67.7 67.2 0.5 75 16 1977 1999 2015 2013 top-third 1995 10 67.4 67.0 0.4 75 16 1977 2023 2015 2013 top-third 1995 11 66.2 66.1 0.1 73 18 1977 2012 2015 2013 top-third 1934,1954,2001 12 64.5 64.7 -0.2 70 21 1977 2012 2015 2013 top-third 1947 18 63.3 63.4 -0.1 68 22 1977 2023 2015 2014 top-third 2003,2014 24 64.4 64.6 -0.2 66 23 1977 2013 2015 2014 top-third 1996 36 64.3 64.6 -0.3 62 25 1977 2019 2011 2015 top-third 1952,1953,1957 48 64.8 64.5 0.3 70 15 1977 2020 2012 2015 top-third 2000,2005,2012 60 65.2 64.5 0.7 76 7 1977 2021 2015 2004 top-tenth 2002,2004,2018