1991-2020 Degrees Fahrenheit 1 53.7 53.1 0.6 74 49 1925 1963 2004 2000 normal 1915 2 60.9 59.1 1.8 103 20 1917 2021 2004 1998 top-third 1998 3 65.1 63.3 1.8 107 16 1976 2021 2004 1983 top-third 1941 4 67.5 65.9 1.6 108 15 1976 2021 2004 1983 top-third 5 68.8 66.7 2.1 115 8 1917 2021 2004 1983 top-tenth 6 67.0 65.7 1.3 109 14 1917 1934 2004 1998 top-third 1955,1998 7 64.9 63.3 1.6 112 10 1907 1991 2004 1991 top-tenth 1922 8 60.9 60.1 0.8 106 16 1917 2012 2004 1998 top-third 1933,1959,1977 9 57.6 56.6 1.0 110 11 1917 2012 2004 1999 top-tenth 1931,1973,1983,1987 10 54.3 53.5 0.8 100 17 1904 2012 2004 2002 top-third 1919,1955,1999,2000 11 52.0 51.4 0.6 95 20 1904 2012 2004 2002 top-third 1955,2022 12 51.3 50.5 0.8 98 16 1904 2012 2004 2002 top-third 1953 18 55.7 55.5 0.2 88 25 1904 2012,2016 2004 2002 top-third 1898,1914,1995,1998,2008 24 50.9 50.5 0.4 90 16 1979 2017 2004 2000 top-third 1955,2006 36 50.1 50.5 -0.4 66 33 1904,1979 2018 2003 2004 top-third 48 50.7 50.5 0.2 78 16 1904 2019 2004 2002 top-third 60 50.3 50.5 -0.2 66 23 1982 2020 2000 2004 top-third 1957,1987,1992,2000,2009,2011,2015