1901-2000 Degrees Fahrenheit 1 41.7 34.2 7.5 126 4 1916 2012 1920 1921 top-tenth 2 34.5 29.6 4.9 118 12 2015 2012 1920 1921 top-tenth 3 31.6 27.8 3.8 117 13 1904 2012 1920 1921 top-tenth 1991,2021 4 31.3 27.9 3.4 108 21 1904 2012 1920 1913 top-third 5 32.2 30.1 2.1 103 26 1918 2012 1920 1913 top-third 6 36.0 33.5 2.5 103 26 1918 2012 1920 1913 top-third 7 39.6 37.3 2.3 104 25 1918 2012 1920 1921 top-third 8 43.3 41.1 2.2 104 25 1904,1905,1918 2012 1920 1921 top-third 9 46.0 44.3 1.7 103 26 1904,1905 2012 1920 1921 top-third 10 47.7 46.3 1.4 101 28 1904 2012 1920 1921 top-third 1951,1983,1992,1997 11 48.1 47.1 1.0 90 39 1918 2012 1920 1913 top-third 1958,1984 12 47.5 46.9 0.6 81 48 1918 2012 1920 1919 normal 1986,1990,2004 18 41.9 42.4 -0.5 30 98 1905 2023 1919 1920 bottom-third 1902,1903,1915,1934,1959,1971 24 46.4 46.9 -0.5 28 100 1905 2023 1919 1920 bottom-third 1897,1925,1936 36 46.8 46.9 -0.1 48 79 1906 2023 1920 1915 normal 1937,1971,1978 48 45.9 46.9 -1.0 9 117 1907 2023 1920 1917 bottom-tenth 1927 60 45.8 46.9 -1.1 9 116 1908 2023 1920 1917 bottom-tenth 1927