1991-2020 Degrees Fahrenheit 1 72.6 71.6 1.0 53 23 1974 2003 2007 2003 top-third 2 73.3 72.4 0.9 56 20 1993 2003 2005 2007 top-third 3 70.0 69.8 0.2 51 25 1993 1988,2021 2005 2007 top-third 1971 4 66.2 66.2 0.0 51 25 1950 1988 2005 2007 top-third 5 61.8 62.1 -0.3 48 28 1950 1988 2005 2007 normal 1960,2019,2022 6 57.7 58.1 -0.4 47 29 1951 2012 2002 2007 normal 7 54.1 54.0 0.1 50 26 1975 2016 2002 2007 normal 2020 8 50.5 50.6 -0.1 50 26 1950 2016 2005 2007 normal 1990,1998,2022 9 47.9 48.0 -0.1 48 27 1950 2012 2002 2007 normal 2017 10 46.8 46.8 0.0 51 24 1979 2012 2004 2007 top-third 1990,2004 11 47.1 46.9 0.2 52 23 1979 2012,2016 2002 2007 top-third 1977,1980 12 48.3 48.1 0.2 51 24 1979 2016 2002 2007 top-third 1977 18 52.3 51.4 0.9 62 13 1951 2016 2005 2007 top-third 2021 24 48.5 48.1 0.4 57 17 1979 2016 2003 2007 top-third 36 49.2 48.1 1.1 68 5 1952 2017 2006 2007 top-tenth 2006 48 49.1 48.2 0.9 67 5 1952 2016 2007 2007 top-tenth 2007,2018 60 48.9 48.2 0.7 67 4 1953 2016 2006 2007 top-tenth