1991-2020 Degrees Fahrenheit 1 60.9 59.8 1.1 67 18 1988 2007 2009 2007 top-third 2 67.1 65.4 1.7 76 8 1940 2007 2009 2007 top-tenth 3 71.2 69.6 1.6 79 5 1940 2005,2007 2009 2007 top-tenth 2018 4 74.2 72.0 2.2 82 2 1940 2016 2009 2005 top-tenth 2005 5 74.7 72.3 2.4 83 1 1940 2010 2009 2010 highest 6 73.4 70.9 2.5 83 1 1940 2010 2009 2010 highest 7 71.3 68.5 2.8 83 1 1940 2010 2009 2010 highest 8 68.5 65.3 3.2 83 1 1940 2010 2009 2010 highest 9 64.7 62.1 2.6 83 1 1940 2010,2012 2009 2010 highest 2012 10 61.6 59.4 2.2 82 2 1940 2012 2009 2010 top-tenth 11 59.4 57.6 1.8 81 3 1940 2012 2009 2010 top-tenth 12 58.9 56.9 2.0 81 3 1940 2012 2009 2002 top-tenth 2002 18 62.1 61.6 0.5 72 11 1948 2016 2009 2008 top-third 1999,2011,2020 24 57.1 56.9 0.2 68 15 1941 2017 2009 2008 top-third 2000 36 57.1 56.9 0.2 67 15 1942 2012 2009 2008 top-third 48 57.5 56.9 0.6 74 7 1943 2013 2009 2008 top-tenth 2022 60 57.6 56.8 0.8 78 2 1944 2020 2009 2010 top-tenth