1901-2000 Degrees Fahrenheit 1 50.4 45.5 4.9 115 15 1895 1927 1917 1911 top-third 1925,1930,1944,2000 2 42.4 44.0 -1.6 39 91 1978 1950 1912 1917 bottom-third 1996 3 40.4 44.0 -3.6 15 114 1977 1932 1905 1917 bottom-third 4 42.3 45.8 -3.5 11 118 1977 1932 1905 1917 bottom-tenth 5 45.0 49.0 -4.0 4 125 1977 1932 1905 1917 bottom-tenth 1905 6 49.4 53.0 -3.6 3 126 1977 1932 1902 1917 bottom-tenth 7 53.3 56.6 -3.3 4 125 1977 2017 1902 1917 bottom-tenth 8 56.5 59.4 -2.9 4 125 1977 2017 1902 1917 bottom-tenth 9 58.6 61.2 -2.6 4 125 1977 2017 1902 1917 bottom-tenth 10 59.2 62.0 -2.8 3 126 1977 2017 1918 1917 bottom-tenth 11 59.4 61.9 -2.5 4 125 1977 2017 1902 1917 bottom-tenth 12 59.0 61.1 -2.1 4 125 1977 2017 1902 1917 bottom-tenth 18 57.2 58.4 -1.2 12 116 1977 2017 1905 1917 bottom-tenth 24 60.2 61.2 -1.0 15 113 1977,1978 2017 1906 1917 bottom-third 1906,1967,1980,2015 36 60.8 61.1 -0.3 30 97 1970 2018 1907 1917 bottom-third 1907,1919,1959,1983,1998 48 60.7 61.1 -0.4 28 98 1970 2019,2020 1907 1917 bottom-third 1986 60 60.9 61.1 -0.2 34 91 1970 2020 1908 1917 bottom-third 1944