1991-2020 Degrees Fahrenheit 1 50.6 49.5 1.1 47 29 2000 2015 2020 2021 normal 2 54.5 52.7 1.8 59 16 1950 2015 2020 2021 top-third 3 57.3 57.1 0.2 49 26 1976 2015 2014 2021 normal 1961 4 61.6 61.9 -0.3 46 29 1976 2015,2016 2014 2021 normal 1954,1958,1991,1999,2002,2011 5 65.4 65.8 -0.4 39 36 1976 2016 2014 2021 normal 1949 6 68.3 68.6 -0.3 44 31 1976 2016 2014 2021 normal 1958,2002 7 70.3 70.1 0.2 54 21 1967,1976 2016 2014 2021 top-third 2004,2010 8 70.8 70.5 0.3 60 15 1976 1998,2016 2021 2020 top-third 1956,1973,1982,2010,2012 9 70.0 69.8 0.2 56 19 1976 2015 2021 2020 top-third 1956,1959,1971,1991,2006,2007 10 69.0 68.6 0.4 60 15 1976 2015,2016 2021 2020 top-third 1973,1977,1991 11 67.6 67.0 0.6 63 12 1968 2016 2021 2020 top-third 12 65.9 65.4 0.5 61 13 1968 2019 2021 2020 top-third 1949,1991 18 67.1 66.5 0.6 63 10 1968 2017 2021 2021 top-third 2021 24 65.8 65.4 0.4 62 10 1969 2017,2020 2015 2021 top-third 36 66.1 65.4 0.7 64 6 1968,1969 2019 2016 2021 top-tenth 48 66.5 65.3 1.2 63 5 1969 2019 2017 2021 top-tenth 60 66.5 65.3 1.2 62 4 1969,1970 2019,2020 2018 2021 top-tenth