1991-2020 Degrees Fahrenheit 1 61.4 64.4 -3.0 39 85 1907 2018 2008 2019 bottom-third 2 56.2 59.1 -2.9 29 95 1907 1977 2008 2019 bottom-third 3 52.7 53.6 -0.9 68 56 1960 2012 2019 2018 normal 1970 4 47.5 48.1 -0.6 78 45 1978 2012 2019 2018 normal 1932 5 44.5 43.9 0.6 98 25 1978 2012 2019 2017 top-third 1933,1964 6 43.0 42.0 1.0 104 18 1978 2012 2019 2017 top-third 7 42.2 42.1 0.1 94 28 1904 2012 2019 2017 top-third 1981,1995 8 43.6 43.8 -0.2 87 35 1904 2012 2019 2018 top-third 1950,2021 9 46.9 46.4 0.5 100 22 1904 2012 2019 2017 top-third 1976,2007 10 49.5 49.2 0.3 96 26 1904 2012 2019 2017 top-third 1941,1948,1981,1992 11 52.1 51.6 0.5 100 22 1904 2012 2019 2017 top-third 1941,1976,2005 12 53.8 53.4 0.4 94 28 1904 2012 2019 2017 top-third 1976,1992 18 49.6 49.6 0.0 90 30 1905 2017 2019 2018 top-third 24 53.5 53.4 0.1 95 25 1905 2017 2019 2018 top-third 1915,1938,1991 36 53.5 53.4 0.1 93 25 1905,1906 2018 2016 2019 top-third 1941,1942,1943,2021 48 54.3 53.3 1.0 114 2 1906 2019 2018 2019 top-tenth 1935,1956,1957,2018 60 54.6 53.3 1.3 113 1 1906 2020 2019 2020 highest