1901-2000 Degrees Fahrenheit 1 15.8 18.5 -2.7 31 99 1934 1981 1911 1910 bottom-third 2 12.1 17.8 -5.7 6 124 1904 2023 1907 1911 bottom-tenth 1907,1934 3 17.4 19.1 -1.7 33 96 1918 2016 1911 1910 bottom-third 1940,1964,1979 4 21.0 22.9 -1.9 23 106 1918 2016 1911 1910 bottom-third 1935,1943,2003 5 25.6 27.5 -1.9 21 108 1918 2023 1911 1910 bottom-third 1940,1945 6 30.4 32.3 -1.9 13 116 1918 2016 1907 1911 bottom-tenth 7 35.1 36.8 -1.7 13 116 1918 2016 1911 1910 bottom-tenth 1965 8 39.4 40.6 -1.2 16 113 1905,1918 2023 1911 1910 bottom-third 1927,1982 9 41.6 42.9 -1.3 14 115 1905,1918 2023 1911 1910 bottom-third 1965 10 43.3 43.9 -0.6 33 96 1918 2023 1911 1909 bottom-third 1940,1948,1982,1987 11 42.8 43.6 -0.8 27 102 1918 2023 1911 1910 bottom-third 1910 12 41.2 42.3 -1.1 17 112 1918 2023 1908 1911 bottom-third 1993 18 37.7 39.0 -1.3 11 117 1905 2017 1908 1911 bottom-tenth 1907 24 41.5 42.3 -0.8 17 111 1918 2023 1908 1911 bottom-third 1936,1968,1994 36 41.5 42.3 -0.8 16 111 1906,1918 2023 1909 1911 bottom-third 48 41.8 42.3 -0.5 24 102 1907 2023 1911 1903 bottom-third 1966 60 41.6 42.3 -0.7 17 108 1908 2023 1911 1903 bottom-third 1926,1930