1901-2000 Degrees Fahrenheit 1 54.6 47.8 6.8 123 7 1940 1950 2016 1974 top-tenth 2 53.9 48.4 5.5 121 8 1977 1950 2016 1974 top-tenth 1949 3 55.9 50.9 5.0 123 6 1977 1932 2016 1974 top-tenth 4 59.4 54.6 4.8 126 3 1977 1932 2016 1950 top-tenth 5 63.4 58.8 4.6 127 2 1977 1932 2016 1932 top-tenth 6 66.5 62.4 4.1 127 2 1977 1932 2016 1932 top-tenth 7 68.8 64.9 3.9 127 2 1977 1932 2016 1932 top-tenth 8 70.2 66.6 3.6 127 2 1977 1932 2016 1932 top-tenth 9 70.4 67.3 3.1 127 2 1977 1999 2016 1999 top-tenth 1932 10 69.8 67.0 2.8 128 1 1977 1999,2017 2016 1999 highest 1999 11 69.1 66.1 3.0 128 1 1977 2017 2016 2017 highest 12 67.7 64.8 2.9 128 1 1902 2017 2016 2017 highest 18 66.6 64.0 2.6 127 1 1970,1977,1978 2017 2016 2017 highest 24 67.0 64.8 2.2 127 1 1970 2017 2016 2017 highest 36 66.1 64.8 1.3 122 5 1904 2018,2019 2016 1934 top-tenth 1934 48 65.4 64.8 0.6 103 23 1905 2020 2016 2002 top-third 1924,1926,1936,1948,1953,1989,1992 60 65.6 64.8 0.8 117 8 1906 2020 2016 1953 top-tenth 1924,1926,1936,1937,1949,1953