1991-2020 Degrees Fahrenheit 1 48.2 52.7 -4.5 14 79 1947 1982 1997 2001 bottom-third 2 43.6 46.3 -2.7 18 75 1947 2010 1997 2001 bottom-third 1935,2004,2014 3 36.8 40.0 -3.2 15 78 1950 2010 1997 2001 bottom-third 1936 4 33.5 34.6 -1.1 43 50 1934 2010 1997 2001 normal 1957,1958,1992 5 31.7 31.0 0.7 76 17 1934 2012 1997 2001 top-third 1953 6 31.8 29.9 1.9 79 12 2014 2012 2001 2000 top-third 7 33.2 30.7 2.5 81 10 1934 2012 2001 2000 top-third 8 35.1 32.7 2.4 82 9 1934 2012 2001 1999 top-tenth 2006 9 37.7 35.6 2.1 82 9 1934 2012 2001 1999 top-tenth 10 40.9 38.7 2.2 83 8 1934 2012 2001 1999 top-tenth 11 43.1 41.2 1.9 82 9 1934 2012 2001 1999 top-tenth 12 44.8 42.9 1.9 84 7 1934 2012 2001 1999 top-tenth 2021 18 39.6 38.5 1.1 77 12 2015 1999 2001 2000 top-third 24 43.4 42.8 0.6 76 13 1935 2017 2001 2000 top-third 36 43.7 42.8 0.9 79 8 1936 2000 1999 2001 top-tenth 1999,2007 48 44.1 42.9 1.2 83 2 1937 2013 2001 2001 top-tenth 2001 60 44.3 42.8 1.5 82 1 1938 2002 2001 2002 highest