1991-2020 Degrees Fahrenheit 1 44.2 30.6 13.6 74 1 1951 2012 2011 2012 highest 2 33.2 25.3 7.9 71 4 2019 1999 2011 1999 top-tenth 3 30.2 22.4 7.8 73 2 1950 1992 2011 1992 top-tenth 4 29.0 21.9 7.1 72 2 1950 1992 2011 1992 top-tenth 5 29.6 23.6 6.0 71 3 1979 2000 2011 2000 top-tenth 6 32.8 27.1 5.7 72 2 1952 2000 2011 2000 top-tenth 7 36.5 31.6 4.9 73 1 1952 2012 2011 2012 highest 8 40.5 36.3 4.2 72 2 1952 1999 2011 1999 top-tenth 2016 9 43.8 40.0 3.8 72 2 1952 1999 2011 2000 top-tenth 2000,2016 10 45.6 42.3 3.3 70 3 1952 2016 2011 2000 top-tenth 1999,2000 11 46.0 43.3 2.7 67 6 1952 1992,1999 2011 2000 top-tenth 12 45.4 43.2 2.2 66 7 1952 1999 2011 2000 top-tenth 18 37.9 37.9 0.0 49 23 1952 2000 2011 2008 top-third 1993 24 42.9 43.2 -0.3 42 29 1952 2000 2011 2008 normal 1977 36 41.8 43.2 -1.4 26 43 1952 2000 2011 2009 normal 48 41.6 43.3 -1.7 22 45 1953 1992,2001 2011 2010 bottom-third 60 42.1 43.3 -1.2 27 38 1954 1992 2011 2010 normal 1978,2013