1991-2020 Degrees Fahrenheit 1 45.8 47.6 -1.8 44 85 1920 1981 2008 2007 normal 1924,1929 2 42.7 43.9 -1.2 79 50 1912 2012 2008 2007 normal 2021 3 40.1 39.7 0.4 99 28 1899 2012 2008 2007 top-third 1943 4 37.5 36.9 0.6 102 23 1912 1992 2008 2006 top-third 1998 5 34.9 35.1 -0.2 87 37 1912 1992 2008 2007 top-third 1938 6 35.9 35.5 0.4 99 22 1912 2000 2008 2006 top-third 1925,1931 7 37.9 37.6 0.3 96 23 1912 2000 2008 2006 top-third 1963 8 40.8 40.9 -0.1 92 26 1912 1981 2008 2006 top-third 1935 9 44.3 44.4 -0.1 93 25 1912 1981 2008 2006 top-third 1963,1972,1990,2011 10 47.6 47.6 0.0 94 24 1912 1981 2008 2006 top-third 1964 11 49.3 49.5 -0.2 88 29 1912 1981 2008 2008 top-third 2008,2011 12 49.9 50.2 -0.3 85 32 1912 1981 1997 2008 top-third 18 44.2 45.3 -1.1 65 47 1909,1916 2000 1997 2008 normal 1931,1983 24 50.1 50.2 -0.1 82 28 1909 2000 1998 2008 top-third 1934 36 50.2 50.2 0.0 84 22 1918 2000 1998 2008 top-third 1982,1991,2016 48 50.4 50.3 0.1 86 16 1918 2002 1999 2008 top-third 60 50.4 50.3 0.1 87 11 1912,1918,1920 2003 2000 2008 top-third 2000,2015