1991-2020 Degrees Fahrenheit 1 67.1 70.7 -3.6 18 96 1928 1956 1995 2002 bottom-third 2 63.4 65.1 -1.7 37 76 1915 1934 1997 2002 bottom-third 1973 3 59.7 59.8 -0.1 65 47 1995 1934,2012 1999 2002 normal 2021 4 55.4 55.3 0.1 80 32 1915 2012 1999 2002 top-third 1921,2021 5 50.1 50.7 -0.6 64 47 1915 2012 1998 2002 normal 1968,1998 6 47.3 47.3 0.0 79 31 1915 2012 2001 2002 top-third 1933,1990,2001 7 45.5 44.9 0.6 88 21 1915 2012 2001 2002 top-third 1938 8 44.9 44.2 0.7 92 17 1917 1934,2012 2001 2002 top-third 1986,1987,2004 9 45.0 45.1 -0.1 80 29 1917 1934,2012 2001 2002 top-third 1921,1967,1974 10 47.0 47.1 -0.1 78 29 1917 1934 2001 2002 top-third 1921 11 49.6 49.5 0.1 81 26 1917,1993 1934 2001 2002 top-third 1972 12 52.0 51.7 0.3 83 24 1993 2012 2001 2002 top-third 1946,1964,1991 18 50.7 50.3 0.4 89 18 1916 2016 2001 2002 top-third 2001 24 52.5 51.7 0.8 94 11 1917 2017 2002 2001 top-third 2001,2004,2005 36 52.2 51.7 0.5 87 16 1917 2017,2018 1999 2002 top-third 1934,1956 48 52.5 51.7 0.8 96 5 1918 2018 2001 2002 top-tenth 2005,2019 60 52.7 51.7 1.0 97 2 1930 2006 2002 2003 top-tenth 2016,2018