1991-2020 Degrees Fahrenheit 1 66.5 67.4 -0.9 42 40 1969 2005 2010 2012 normal 2 62.5 62.6 -0.1 50 32 1947 2018 2011 2012 normal 1980 3 55.0 56.8 -1.8 22 60 1947 1987 2008 2012 bottom-third 1954,1968,2008 4 47.8 50.6 -2.8 17 65 1947 2012 2008 2012 bottom-third 1982,2008 5 42.0 44.6 -2.6 24 58 1947 2012 2008 2012 bottom-third 1963,2003 6 38.0 39.9 -1.9 34 47 1979 2012 2009 2012 normal 7 36.5 37.5 -1.0 54 27 1979 2012 2011 2012 top-third 2001,2015 8 36.4 37.1 -0.7 54 25 1979 2012 2011 2012 top-third 9 37.7 38.4 -0.7 53 26 1979 2012 2011 2012 top-third 1981 10 39.8 40.7 -0.9 51 28 1943,1979 2012,2016 2011 2012 normal 11 42.7 43.3 -0.6 54 25 1943 2012 2011 2012 top-third 1949,1976 12 45.6 45.6 0.0 59 20 1943,1951,1979 2012 2011 2012 top-third 2004 18 45.8 43.7 2.1 74 4 1951 1999 2011 2012 top-tenth 2016 24 47.7 45.6 2.1 73 3 1952,1979 2017 2012 1999 top-tenth 36 46.8 45.6 1.2 68 6 1979 2000 2011 2012 top-tenth 2001,2002 48 46.8 45.6 1.2 69 3 1968,1980 2001,2002 2012 2002 top-tenth 60 46.2 45.6 0.6 64 6 1969 2002 2012 2008 top-tenth 2008,2016