1901-2000 Degrees Fahrenheit 1 51.6 54.0 -2.4 22 108 1967 1989 1901 1902 bottom-third 1998 2 49.2 51.4 -2.2 17 113 1967 1934 1902 1901 bottom-third 1929,1945,1983 3 45.6 49.4 -3.8 2 128 1922 2015 1903 1902 bottom-tenth 1975 4 44.7 47.6 -2.9 6 124 1922 2015 1903 1902 bottom-tenth 5 44.2 46.7 -2.5 7 122 1917,1949 2015 1903 1902 bottom-tenth 1929 6 44.7 47.2 -2.5 4 125 1917 2015 1903 1902 bottom-tenth 7 46.6 48.9 -2.3 3 126 1917 2015 1903 1902 bottom-tenth 8 49.4 51.4 -2.0 6 123 1917 2015 1903 1902 bottom-tenth 9 51.9 53.9 -2.0 5 124 1917 2015 1903 1902 bottom-tenth 10 54.0 56.0 -2.0 4 125 1917 2015 1903 1902 bottom-tenth 11 55.4 57.1 -1.7 5 124 1917 2015 1903 1902 bottom-tenth 1955 12 55.6 57.4 -1.8 5 124 1917 2015 1903 1902 bottom-tenth 18 52.7 54.0 -1.3 5 123 1949 2015 1903 1902 bottom-tenth 1933 24 56.3 57.4 -1.1 8 120 1913 2015 1903 1902 bottom-tenth 1904,1909,1912 36 56.5 57.4 -0.9 12 115 1913,1917 2016 1903 1902 bottom-tenth 1904,1909,1923 48 56.6 57.4 -0.8 16 110 1913 2016,2018 1903 1902 bottom-third 1904,1909 60 56.7 57.3 -0.6 16 109 1913 2018 1903 1902 bottom-third 1904,1918,1925,1950,1952