1991-2020 Degrees Fahrenheit 1 73.9 73.3 0.6 49 27 1993 2021 2004 2007 normal 2 68.7 68.9 -0.2 47 29 1993 2021 2005 2007 normal 1964,1987,2005 3 64.1 64.4 -0.3 46 30 1950 1988 2005 2007 normal 1957 4 59.0 59.7 -0.7 36 40 1950 1988 2002 2007 normal 1984,1986,2019 5 54.8 55.4 -0.6 48 28 1951 2012 2002 2007 normal 2020 6 51.0 51.0 0.0 51 25 1975 2016 2003 2007 top-third 2003 7 47.3 47.6 -0.3 44 32 1950 2016 2002 2007 normal 8 44.9 45.0 -0.1 46 29 1950 2016 2002 2007 normal 9 43.9 44.0 -0.1 48 27 1979 2016 2002 2007 normal 10 44.6 44.4 0.2 52 23 1979 2016 2002 2007 top-third 1994,1998 11 46.1 46.0 0.1 52 23 1979 2016 2002 2007 top-third 1964,1983 12 48.2 48.1 0.1 52 23 1979 2016 2003 2007 top-third 18 49.8 49.1 0.7 62 13 1979 2016 2005 2007 top-third 2004,2005 24 48.5 48.1 0.4 58 16 1979 2016 2003 2007 top-third 2001,2015 36 49.1 48.1 1.0 66 7 1952 2017 2005 2007 top-tenth 48 49.0 48.2 0.8 65 7 1952 2015,2016 2005 2007 top-tenth 60 49.0 48.2 0.8 68 3 1953 2016 2007 2007 top-tenth 2007