1991-2020 Degrees Fahrenheit 1 35.0 35.7 -0.7 81 45 1960 2012 1978 1977 normal 1922 2 25.5 31.7 -6.2 15 111 1899 2012 1978 1977 bottom-third 3 23.1 30.0 -6.9 6 118 1904 2012 1978 1977 bottom-tenth 4 24.3 30.5 -6.2 9 115 1904 2012 1978 1977 bottom-tenth 5 27.2 32.6 -5.4 9 115 1904 2012 1978 1976 bottom-tenth 6 30.9 35.8 -4.9 6 118 1904 2012 1978 1976 bottom-tenth 7 35.7 39.8 -4.1 7 117 1904 2012 1978 1976 bottom-tenth 1994 8 40.0 43.6 -3.6 9 115 1904 2012 1978 1976 bottom-tenth 2014 9 43.2 46.8 -3.6 8 116 1904 2012 1978 1976 bottom-tenth 1926,1930 10 45.4 48.8 -3.4 11 113 1918 2012 1978 1976 bottom-tenth 1925 11 46.6 49.7 -3.1 13 110 1918 2012 1977 1978 bottom-third 1917,1941 12 46.5 49.4 -2.9 15 107 1918 2012 1977 1978 bottom-third 1916 18 41.2 44.9 -3.7 4 114 1918 2017 1918 1978 bottom-tenth 24 46.9 49.4 -2.5 18 98 1918 2013,2017 1978 1977 bottom-third 1928,1931,2015 36 46.5 49.4 -2.9 7 105 1918 2013 1927 1978 bottom-tenth 48 47.4 49.4 -2.0 19 89 1918,1919 2002,2013,2023 1970 1978 bottom-third 1970 60 47.5 49.4 -1.9 18 87 1920 2002,2020,2023 1963 1978 bottom-third 1939,1941,1944,1963