1991-2020 Degrees Fahrenheit 1 53.5 47.1 6.4 82 4 1950 2010 2005 1987 top-tenth 2 43.6 40.2 3.4 73 12 1950 2012 2005 2000 top-third 1981 3 35.7 33.7 2.0 66 19 1965 2012 2003 2005 top-third 4 33.9 29.3 4.6 80 5 1950 2012 2005 1998 top-tenth 5 31.0 27.8 3.2 78 7 2014 2012 2005 2000 top-tenth 6 32.0 29.0 3.0 77 8 1951 2012 2005 2002 top-tenth 7 34.9 31.9 3.0 77 8 1951 2012 2005 2002 top-tenth 8 38.8 35.9 2.9 80 5 1951 2012 2005 2000 top-tenth 1999,2000 9 42.5 39.9 2.6 81 4 1951 2012 2005 1999 top-tenth 1999 10 45.9 43.3 2.6 81 4 1951 2012 2005 2000 top-tenth 2000 11 48.4 45.7 2.7 81 4 1951 2012 2005 2006 top-tenth 12 49.1 46.9 2.2 81 4 1951 2012 2005 2006 top-tenth 18 43.0 40.9 2.1 79 5 1951 2017 2005 2000 top-tenth 2012 24 48.0 46.9 1.1 77 7 1952 2017 2005 2000 top-tenth 2018 36 47.7 46.9 0.8 75 8 1952 2000,2017,2018 2005 2000 top-tenth 48 47.2 46.9 0.3 69 13 1953 2019 2005 2005 top-third 2005,2009 60 47.6 46.9 0.7 78 3 1952 2002,2020 2005 2002 top-tenth 2019