1991-2020 Degrees Fahrenheit 1 46.7 41.9 4.8 63 12 1950 1987 2011 2006 top-third 2 45.5 36.3 9.2 74 1 1950 2012 2011 2012 highest 3 37.7 30.8 6.9 74 1 2019 2012 2011 2012 highest 4 34.3 27.3 7.0 73 2 1950 1992 2011 1992 top-tenth 5 32.6 25.9 6.7 72 2 1950 1992 2011 1992 top-tenth 6 32.5 26.7 5.8 72 2 1979 2000 2011 2000 top-tenth 7 34.8 29.2 5.6 73 1 1950 2000,2012 2011 2000 highest 2000 8 37.8 32.9 4.9 73 1 1950 2012 2011 2012 highest 9 41.2 36.9 4.3 73 1 1965 2012 2011 2012 highest 10 44.1 40.2 3.9 73 1 1952 1999,2012 2011 1999 highest 1999 11 45.7 42.3 3.4 72 1 1952 2012 2011 2012 highest 12 46.1 43.2 2.9 68 5 1951,1952 1981 2011 2000 top-tenth 2016 18 37.7 37.7 0.0 46 26 1951 2000 2011 2008 normal 1982,1998 24 43.0 43.2 -0.2 42 29 1952 2000 2011 2008 normal 1954,1998 36 42.1 43.2 -1.1 30 39 1952 2000 2011 2009 normal 1962 48 41.7 43.2 -1.5 23 44 1953 2001 2011 2010 normal 1962 60 42.2 43.3 -1.1 29 36 1954 1992 2011 2010 normal 1965,1978,1996