1901-2000 Degrees Fahrenheit 1 34.7 41.1 -6.4 6 124 1960 2012 1896 1895 bottom-tenth 1941 2 33.4 36.5 -3.1 21 109 1978 2012 1895 1896 bottom-third 1924 3 32.2 34.1 -1.9 36 94 1978 2012 1895 1896 bottom-third 1901 4 32.7 33.7 -1.0 43 86 1978 2012 1896 1896 bottom-third 1906 5 34.5 35.4 -0.9 39 90 1978 2012 1896 1896 bottom-third 1901,1934,1956,1962 6 36.6 38.6 -2.0 20 109 1977 2012 1896 1896 bottom-third 1968 7 41.3 42.5 -1.2 28 101 1977 1932 1896 1896 bottom-third 1915,1951,2001 8 45.3 46.2 -0.9 31 98 1977 2017 1896 1896 bottom-third 9 48.2 49.3 -1.1 25 104 1977 2017 1896 1896 bottom-third 1969,1996 10 50.7 51.3 -0.6 34 95 1977 2017 1896 1896 bottom-third 1917,1981 11 51.7 52.3 -0.6 37 92 1977 2012,2017 1896 1896 bottom-third 1924,1929,1930,1940,1947,1981 12 51.8 52.2 -0.4 42 87 1977 2012 1896 1896 bottom-third 1910 18 -99 47.6 -99 -99 -99 1978 2017 normal 24 -99 52.2 -99 -99 -99 1978 2017 normal 36 -99 52.2 -99 -99 -99 1979 2018 normal 48 -99 52.2 -99 -99 -99 1980 2019,2020 normal 60 -99 52.2 -99 -99 -99 1981 2020 normal