1925-2000 Degrees Fahrenheit 1 51.3 47.9 3.4 87 12 2012 2005,2015 2013 2015 top-third 1925 2 47.3 44.2 3.1 91 8 1950,1972 2005 2014 2015 top-tenth 3 44.9 40.5 4.4 97 2 1972 2005 2015 2005 top-tenth 4 42.5 37.4 5.1 98 1 1972 2016 2015 2016 highest 5 40.6 34.9 5.7 98 1 1972 2016 2015 2016 highest 6 38.6 33.6 5.0 96 2 1972 1926 2015 1926 top-tenth 7 37.8 33.3 4.5 96 2 1972 1926 2015 1926 top-tenth 8 38.5 34.3 4.2 96 2 1972 1926 2015 1926 top-tenth 9 39.6 36.0 3.6 96 2 1972 1926 2015 1926 top-tenth 10 41.3 38.0 3.3 96 2 1956,1972 1926 2015 1926 top-tenth 11 42.5 39.6 2.9 96 2 1956 1926 2015 1998 top-tenth 1998 12 43.6 40.8 2.8 94 4 1956 1926 2015 2005 top-tenth 18 41.7 38.4 3.3 96 1 1972 1927,2016 2015 1927 highest 1927 24 43.3 40.8 2.5 95 2 1972 1927 2015 1927 top-tenth 36 43.0 40.8 2.2 94 2 1973 1928 2015 1928 top-tenth 48 42.0 40.8 1.2 86 9 1974 1929 2015 2006 top-tenth 2005 60 41.6 40.7 0.9 73 21 1975 1930 2015 2007 top-third 1991,1993,2000,2007,2021