1901-2000 Degrees Fahrenheit 1 27.9 29.2 -1.3 33 97 2008 2016 1896 1898 bottom-third 1903 2 24.9 25.8 -0.9 45 85 1917 1934 1898 1899 normal 1902,1929 3 20.6 23.0 -2.4 18 112 1933,1955 1934 1899 1898 bottom-third 4 20.1 20.7 -0.6 46 84 1922 1934 1898 1896 normal 1920,1924,1935 5 18.1 19.8 -1.7 26 103 1949 1934 1899 1898 bottom-third 1962 6 18.3 20.3 -2.0 19 110 1917 1934 1899 1898 bottom-third 1913,1957 7 19.8 21.9 -2.1 15 114 1917 1934 1899 1898 bottom-third 8 22.2 24.2 -2.0 15 114 1917 1934 1899 1898 bottom-third 1936 9 25.4 26.8 -1.4 19 110 1917 1934 1899 1898 bottom-third 10 27.6 29.0 -1.4 16 113 1917 2015 1899 1898 bottom-third 1957,1960 11 29.0 30.3 -1.3 18 111 1917 1934 1899 1898 bottom-third 12 29.6 30.8 -1.2 17 112 1917 2015,2016 1899 1898 bottom-third 1960 18 26.2 27.3 -1.1 15 113 1917 2016 1899 1898 bottom-third 1920,1957 24 30.1 30.8 -0.7 19 109 1917 2016 1899 1898 bottom-third 1955 36 30.3 30.8 -0.5 23 104 1933 2016,2017 1899 1898 bottom-third 1905,1912,1929,1944 48 30.3 30.8 -0.5 19 107 1932,1933 2018 1899 1899 bottom-third 1914,1915,1922,1924,1934,1949 60 -99 30.8 -99 -99 -99 1933 2018 normal