1901-2000 Degrees Fahrenheit 1 48.4 52.8 -4.4 10 120 1907 2010 1961 1981 bottom-tenth 1918 2 45.4 47.2 -1.8 37 93 1926 2012 1980 1981 bottom-third 1934 3 38.9 42.0 -3.1 20 110 1978 2012 1980 1981 bottom-third 1923,1934 4 34.1 38.4 -4.3 9 121 1978 2012 1979 1981 bottom-tenth 5 33.0 37.1 -4.1 8 121 1978 2012 1979 1981 bottom-tenth 2014 6 35.0 37.9 -2.9 13 116 1978 2012 1979 1981 bottom-tenth 1920 7 37.7 40.5 -2.8 12 117 1978 2012 1979 1981 bottom-tenth 1970 8 41.1 43.8 -2.7 8 121 1904,1918,1978 2017 1978 1981 bottom-tenth 1902 9 44.6 47.2 -2.6 7 122 1918 2017 1978 1981 bottom-tenth 10 47.8 50.1 -2.3 9 120 1918 2012 1978 1981 bottom-tenth 11 50.2 52.2 -2.0 12 117 1904,1918 2012 1979 1981 bottom-tenth 1968,1979 12 50.9 53.1 -2.2 7 122 1918 2012 1978 1981 bottom-tenth 18 46.9 48.0 -1.1 16 112 1905,1979 2017 1980 1981 bottom-third 1906,1959,1971 24 52.5 53.1 -0.6 32 96 1978 2017 1980 1981 bottom-third 1951 36 52.2 53.0 -0.8 14 113 1979 2018 1980 1981 bottom-third 1919,1926 48 51.9 53.0 -1.1 8 118 1980 2019 1981 1981 bottom-tenth 1978,1981 60 51.7 53.0 -1.3 3 122 1981 2020 1981 1979 bottom-tenth 1906,1908,1979