1991-2020 Degrees Fahrenheit 1 40.6 42.3 -1.7 45 83 1977 1950 1963 1960 normal 2 37.9 43.6 -5.7 8 120 1918 1932 1936 1963 bottom-tenth 3 42.5 46.2 -3.7 15 113 1918 1932 1961 1963 bottom-third 1936,1961 4 47.6 50.1 -2.5 24 103 1918 1932 1958 1962 bottom-third 1910,1936,1958 5 52.0 54.5 -2.5 16 111 1918 1932 1938 1962 bottom-third 1915,2010 6 56.2 58.5 -2.3 15 112 1918 1932 1938 1962 bottom-third 1969,1981,1996 7 59.1 61.5 -2.4 13 114 1918 1932 1951 1962 bottom-tenth 1915,1938 8 60.9 63.3 -2.4 11 116 1977 1932 1918 1962 bottom-tenth 9 61.7 63.9 -2.2 13 114 1977 1932,2017 1918 1962 bottom-tenth 10 61.8 63.6 -1.8 22 105 1977 2017 1962 1961 bottom-third 1903,1981,1998,2014 11 61.1 62.6 -1.5 33 94 1918,1977 2017 1962 1960 bottom-third 1924,1966,1990 12 59.2 61.2 -2.0 22 105 1918 2017 1961 1962 bottom-third 1915,1993,1994 18 -99 60.3 -99 -99 -99 1905 2017 normal 24 -99 61.2 -99 -99 -99 1903 2017 normal 36 -99 61.1 -99 -99 -99 1904 2018,2019 normal 48 -99 61.1 -99 -99 -99 1905 2020 normal 60 -99 61.1 -99 -99 -99 1906 2020 normal