1901-2000 Degrees Fahrenheit 1 33.6 29.3 4.3 99 31 1977 2006 1897 1898 top-third 2 33.4 30.9 2.5 85 44 1918 1932 1897 1898 normal 1975,1991 3 36.5 34.7 1.8 89 40 1977 1932 1897 1898 top-third 1941 4 41.9 39.6 2.3 101 28 1977 1932 1897 1898 top-third 5 47.1 44.8 2.3 110 19 1977 1932 1897 1898 top-third 1949,2023 6 51.0 49.4 1.6 101 28 1977 1932 1897 1898 top-third 2019 7 54.5 52.9 1.6 107 22 1977 1932 1897 1898 top-third 1907,1934,1947,1949,2013 8 56.3 55.0 1.3 95 34 1977 1932 1897 1898 top-third 1900,1939,1953 9 56.5 55.8 0.7 84 45 1977 1932 1897 1898 normal 1906,1995,2011 10 55.9 55.3 0.6 75 54 1918 1932 1896 1897 normal 1916 11 54.8 54.0 0.8 83 46 1918 2017 1897 1898 normal 1986 12 53.0 52.2 0.8 87 42 1918 2017 1897 1898 top-third 1933,2003,2011 18 51.6 51.3 0.3 75 53 1918 2017 1897 1898 normal 1909,1986,1989,1993,1996 24 52.8 52.2 0.6 87 41 1918 2013 1897 1898 top-third 1899,1901,1939 36 52.2 52.2 0.0 53 74 1918,1979 2019 1898 1898 normal 1902,1909,1911,1915,1946 48 -99 52.2 -99 -99 -99 1980 2020 normal 60 -99 52.2 -99 -99 -99 1981 2021 normal