1991-2020 Degrees Fahrenheit 1 61.5 63.5 -2.0 17 43 1993 2005 2006 2019 bottom-third 2 66.8 67.3 -0.5 33 27 1992 2005 2014 2019 normal 1970,2011 3 69.8 69.1 0.7 45 15 1992 2005,2016 2017 2019 top-third 4 69.7 69.1 0.6 44 16 1992 2005 2017 2019 top-third 1987,1995 5 67.1 67.1 0.0 38 22 1992 2018 2017 2019 normal 6 63.3 63.8 -0.5 32 28 1992 2010 2014 2019 normal 1964 7 59.8 59.8 0.0 40 20 1992 2012 2019 2018 top-third 2022 8 55.7 55.7 0.0 40 20 1978 2012 2019 2018 top-third 2011 9 53.0 52.2 0.8 45 15 1978 2012 2019 2018 top-third 2005 10 51.1 50.1 1.0 47 13 1978 2012 2019 2017 top-third 11 49.6 49.1 0.5 43 16 1978 2012 2019 2017 top-third 12 49.6 49.3 0.3 40 19 1978 2012 2019 2018 top-third 18 54.4 54.2 0.2 39 20 1979 2012 2019 2018 normal 24 49.0 49.3 -0.3 34 24 1979 2017 2015 2019 normal 36 49.3 49.3 0.0 41 16 1979 2012 2016 2019 top-third 48 49.7 49.3 0.4 46 10 1980 2013 2017 2019 top-third 60 50.2 49.2 1.0 53 2 1982 2002 2019 2002 top-tenth