1991-2020 Degrees Fahrenheit 1 67.1 69.8 -2.7 43 84 1909 2015 1909 1908 normal 2 63.5 66.5 -3.0 15 112 1954 2015 1909 1908 bottom-third 1919,1920,1962,1964 3 62.0 63.7 -1.7 38 88 1916 2015 1909 1907 bottom-third 1912,1923,1983,2001 4 59.6 60.7 -1.1 52 74 1899,1955 2021 1909 1907 normal 1914,1943 5 57.9 58.2 -0.3 82 42 1955 2015 1909 1905 normal 1915,1924,1939,1978,1986 6 54.8 55.9 -1.1 53 70 1917 2015 1909 1907 normal 1918,1927 7 52.4 54.0 -1.6 42 80 1916,1917 2015 1909 1907 normal 1907 8 50.2 52.5 -2.3 18 103 1917 2015 1909 1907 bottom-third 1964 9 49.7 51.8 -2.1 20 101 1917 2015 1909 1907 bottom-third 1979 10 50.0 52.1 -2.1 15 106 1917 2015 1909 1907 bottom-third 1911 11 51.1 53.2 -2.1 17 103 1917 2015 1909 1907 bottom-third 12 52.3 54.6 -2.3 12 106 1917 2015 1899 1907 bottom-tenth 1912,1976 18 52.6 55.0 -2.4 6 110 1917 2015,2016 1904 1907 bottom-tenth 1904,1912,1956 24 -99 54.6 -99 -99 -99 1917 2016 normal 36 -99 54.6 -99 -99 -99 1917 2016,2017 normal 48 -99 54.6 -99 -99 -99 1913 2018 normal 60 -99 54.6 -99 -99 -99 1919 2018,2019 normal