1901-2000 Degrees Fahrenheit 1 45.4 48.8 -3.4 15 115 1897 1934 1897 1911 bottom-third 1938 2 46.0 47.1 -1.1 36 94 1903 2015 1911 1910 bottom-third 1966 3 45.2 45.5 -0.3 48 82 1949 2015 1911 1907 normal 1920,2019 4 43.9 44.9 -1.0 29 100 1949 2015 1910 1911 bottom-third 1946 5 44.8 45.8 -1.0 25 104 1949 2015 1910 1911 bottom-third 1945,1966,1975 6 46.8 48.1 -1.3 21 108 1917 2015 1910 1911 bottom-third 1897 7 49.3 51.0 -1.7 9 120 1917 2015 1903 1911 bottom-tenth 1962 8 52.0 53.8 -1.8 5 124 1917 2015 1903 1911 bottom-tenth 1903 9 54.6 56.2 -1.6 6 123 1917 2015 1903 1911 bottom-tenth 10 55.8 57.4 -1.6 5 124 1917 2015 1903 1911 bottom-tenth 11 55.9 57.7 -1.8 4 125 1917 2015 1912 1911 bottom-tenth 12 55.6 57.4 -1.8 4 125 1917 2015 1912 1911 bottom-tenth 18 53.1 54.3 -1.2 7 121 1949 2015 1910 1911 bottom-tenth 1904,1910,1922,1933 24 56.6 57.4 -0.8 15 113 1913 2015 1910 1911 bottom-third 1908,1920,1923 36 56.5 57.4 -0.9 10 117 1913,1917 2016 1910 1911 bottom-tenth 1903,1904,1909,1915,1921,1923 48 56.4 57.4 -1.0 5 121 1913 2018 1910 1911 bottom-tenth 1910,1914,1917,1918,1922 60 56.4 57.3 -0.9 4 121 1913,1917 2018 1912 1911 bottom-tenth 1914,1916,1919,1920,1949