1991-2020 Degrees Fahrenheit 1 51.5 53.2 -1.7 48 76 1919 1950 1925 1926 normal 2 56.8 60.2 -3.4 32 92 1912 2015 1925 1926 bottom-third 3 60.8 65.5 -4.7 11 113 1912 2015 1925 1926 bottom-tenth 1900 4 64.2 69.0 -4.8 11 113 1912 2003 1925 1926 bottom-tenth 5 64.9 69.8 -4.9 11 113 1912 2018 1925 1926 bottom-tenth 1915 6 63.8 68.5 -4.7 12 112 1912 2018 1923 1926 bottom-tenth 1941 7 61.7 66.1 -4.4 15 109 1912 2018 1923 1926 bottom-third 1929 8 58.8 63.5 -4.7 12 112 1912 2012 1924 1926 bottom-tenth 1957,1975 9 56.0 60.3 -4.3 19 105 1917 2012,2018 1923 1926 bottom-third 1915,1941,1942,1948 10 52.9 57.1 -4.2 29 95 1917 2012,2018 1925 1926 bottom-third 1909,1942 11 50.4 54.4 -4.0 29 94 1917 2018 1925 1926 bottom-third 1923,1937,1984 12 49.3 53.2 -3.9 31 92 1917 2018 1925 1926 bottom-third 1979 18 54.8 58.3 -3.5 34 89 1917 2018 1925 1926 bottom-third 1923,1955,1975 24 50.1 53.2 -3.1 46 76 1913,1917 2018 1926 1902 normal 1946,1947,1957,1964,1973 36 49.4 53.2 -3.8 30 91 1917 2018 1926 1923 bottom-third 1908,1909 48 49.2 53.1 -3.9 25 95 1920 2018 1926 1924 bottom-third 1908,1909 60 49.2 53.1 -3.9 23 96 1917 2018,2019,2021 1925 1926 bottom-third 1905,1949,1952