1991-2020 Degrees Fahrenheit 1 39.6 34.7 4.9 84 9 1960 2012 2003 2000 top-tenth 2 30.5 28.5 2.0 72 21 1936 2012 2003 2000 top-third 3 25.7 25.0 0.7 67 26 1936 2012 2003 2002 top-third 1935 4 25.9 24.3 1.6 74 18 1936 2012 2003 2002 top-third 2007 5 27.3 26.3 1.0 74 18 1936 2012 2003 2002 top-third 6 31.4 30.3 1.1 76 16 1936 2012 2003 2002 top-third 1976 7 35.7 35.0 0.7 73 18 1936 2012 2003 2002 top-third 1954,2020 8 40.5 39.7 0.8 75 16 1936 2012 2003 2002 top-third 1954,1991 9 44.3 43.5 0.8 75 16 1936 2012 2003 2002 top-third 10 46.6 46.1 0.5 70 21 1936 2012 2001 2003 top-third 1942,1976,2007,2020 11 47.5 47.3 0.2 64 27 1936 2012 2001 2003 top-third 12 47.6 47.3 0.3 68 23 1936 2012 2001 2003 top-third 1934,1991 18 41.6 41.6 0.0 66 24 1979 2017 2002 2003 top-third 2002 24 47.6 47.3 0.3 65 24 1952 2017 2002 2003 top-third 36 48.4 47.3 1.1 79 8 1952 2017,2018 2003 2000 top-tenth 2008 48 47.5 47.4 0.1 65 20 1952 2018 2000 2003 top-third 2014,2020 60 47.9 47.4 0.5 72 11 1952 2006 2001 2003 top-third 1991,2019