1991-2020 Degrees Fahrenheit 1 33.1 32.1 1.0 82 41 1983 2021 1953 1952 top-third 2 37.8 37.4 0.4 88 35 2000 2015 1951 1953 top-third 3 43.9 43.3 0.6 90 33 1976 1931 1952 1953 top-third 1979,2017 4 50.7 49.3 1.4 106 17 1976 1931 1952 1953 top-third 2004,2011 5 55.6 54.2 1.4 107 16 1976 1931 1952 1953 top-third 1956,2001 6 59.6 57.8 1.8 110 13 1917 1931 1953 1947 top-third 1971 7 62.1 59.9 2.2 116 7 1917 1931 1953 1941 top-tenth 1936 8 61.6 60.5 1.1 102 21 1917 1931 1952 1953 top-third 1965 9 61.1 59.7 1.4 112 11 1917 1931 1953 1941 top-tenth 2001,2010,2011 10 58.7 58.0 0.7 101 22 1917 2012 1952 1953 top-third 1934,1939,2001,2006 11 56.9 55.6 1.3 113 9 1917 2012 1953 1946 top-tenth 1946,2021 12 54.7 53.2 1.5 113 9 1917 2012 1953 1938 top-tenth 2021 18 56.2 54.7 1.5 116 5 1904 2012 1953 1931 top-tenth 24 54.6 53.2 1.4 117 3 1904,1905 2017 1953 1954 top-tenth 2006,2007 36 54.1 53.2 0.9 112 6 1905 2017 1953 1954 top-tenth 2006 48 53.2 53.1 0.1 94 22 1905 2018 1953 1941 top-third 2009 60 52.6 53.1 -0.5 69 45 1905,1906 2020 1953 1949 normal 1937,1948,1959