1901-2000 Degrees Fahrenheit 1 54.4 55.7 -1.3 35 95 1917 2015 1920 1922 bottom-third 1898,1995 2 49.3 50.2 -0.9 29 101 1917 2010 1920 1922 bottom-third 1947 3 42.5 44.9 -2.4 12 118 1967 2012 1920 1922 bottom-tenth 1920 4 36.2 39.9 -3.7 6 124 1907 2012 1917 1922 bottom-tenth 5 33.0 36.8 -3.8 2 128 1907 2012 1920 1922 bottom-tenth 1904,1920 6 31.7 35.3 -3.6 5 124 1904 2012 1920 1922 bottom-tenth 7 32.7 35.9 -3.2 6 123 1904,1905 2012 1920 1922 bottom-tenth 8 34.9 37.7 -2.8 8 121 1905 2012 1920 1922 bottom-tenth 9 37.8 40.2 -2.4 7 122 1905 2012 1920 1922 bottom-tenth 1934 10 40.7 42.9 -2.2 6 123 1905 2012 1920 1922 bottom-tenth 1907 11 43.2 45.3 -2.1 6 123 1905 2012 1920 1922 bottom-tenth 1907 12 45.1 46.9 -1.8 7 122 1904 2012 1920 1922 bottom-tenth 1926 18 41.7 43.1 -1.4 11 117 1905 2023 1918 1922 bottom-tenth 1935 24 46.0 46.9 -0.9 15 113 1905 2023 1920 1922 bottom-third 1920 36 46.8 46.9 -0.1 48 79 1906 2023 1922 1921 normal 1921,1945,1948,1972,1978 48 46.3 46.9 -0.6 19 107 1907 2023 1921 1922 bottom-third 1912,1914,1937,1968 60 46.5 46.9 -0.4 29 96 1908 2023 1922 1913 bottom-third 1901,1902,1938,1943,1944,1966,1968,1970,1971