1901-2000 Degrees Fahrenheit 1 64.2 64.4 -0.2 55 75 1917 2018 1901 1903 normal 2003,2011 2 57.1 59.8 -2.7 9 121 1907 1896 1901 1903 bottom-tenth 1971 3 53.5 55.0 -1.5 25 105 1960 2012 1901 1903 bottom-third 1915 4 48.5 50.4 -1.9 18 112 1960 2012 1901 1903 bottom-third 1926,1993 5 44.9 47.0 -2.1 14 116 1978 2012 1895 1903 bottom-third 1984 6 42.3 45.2 -2.9 3 126 1978 2012 1904 1903 bottom-tenth 1984 7 42.1 45.3 -3.2 3 126 1978 2012 1904 1903 bottom-tenth 8 43.9 46.7 -2.8 4 125 1978 2012,2017 1904 1903 bottom-tenth 9 46.6 49.2 -2.6 4 125 1978 2017 1904 1903 bottom-tenth 10 49.5 51.7 -2.2 5 124 1977 2017 1904 1903 bottom-tenth 1970 11 52.0 54.0 -2.0 5 124 1977 2017 1904 1903 bottom-tenth 12 53.3 55.5 -2.2 5 124 1977 2017 1904 1903 bottom-tenth 18 51.0 52.1 -1.1 15 113 1979 2017 1902 1903 bottom-third 1941,1960,1963,1997,2015 24 55.0 55.5 -0.5 28 100 1978 2017 1904 1903 bottom-third 1941,1966 36 54.9 55.5 -0.6 22 105 1979 2018 1904 1903 bottom-third 1920,1966,2015 48 55.2 55.5 -0.3 32 94 1980 2019 1904 1903 bottom-third 1959 60 55.3 55.5 -0.2 33 92 1981 2020 1904 1903 bottom-third 1986,1996,1998