1991-2020 Degrees Fahrenheit 1 49.1 52.0 -2.9 45 84 1917 1934 1922 1921 normal 2 43.7 47.3 -3.6 30 99 1917 2012 1922 1919 bottom-third 1944 3 38.1 43.8 -5.7 14 115 1917 2012 1920 1922 bottom-third 4 34.3 40.2 -5.9 10 119 1899 1992 1920 1922 bottom-tenth 5 33.6 37.9 -4.3 28 101 1899 1992,2012 1922 1921 bottom-third 1898 6 32.7 36.3 -3.6 31 97 1917 1992 1922 1921 bottom-third 1951 7 32.4 36.2 -3.8 21 106 1899 2000 1922 1922 bottom-third 1898,1922 8 34.1 37.5 -3.4 24 103 1899 2000 1920 1922 bottom-third 1948,1975 9 36.9 39.9 -3.0 29 98 1899 1934 1920 1922 bottom-third 1898,1919,1948,1971 10 40.0 42.7 -2.7 41 86 1917 2017 1922 1911 bottom-third 1948,2010 11 42.2 45.1 -2.9 36 91 1899 2017 1922 1922 bottom-third 1901,1918,1922 12 43.9 46.6 -2.7 46 81 1899,1917 2017 1922 1911 normal 1944,1965 18 39.8 43.1 -3.3 23 103 1899,1913 2017 1921 1922 bottom-third 1898,1907,1965 24 43.8 46.6 -2.8 39 86 1913,1917 2017 1922 1911 bottom-third 1933,1945,1947,1963,1980 36 43.7 46.6 -2.9 33 90 1914 2018 1922 1912 bottom-third 1911,1912,1947,1948 48 43.5 46.5 -3.0 31 90 1899 2018 1922 1911 bottom-third 1903,1949 60 43.5 46.5 -3.0 30 89 1917 2018 1922 1911 bottom-third 1926,1927,1949