1991-2020 Degrees Fahrenheit 1 70.1 71.5 -1.4 56 72 1924 2012 2000 1999 normal 2 67.3 69.3 -2.0 48 80 1929 2012 2000 1999 normal 1948,1968 3 64.7 65.3 -0.6 82 45 1917,1924 2012 2000 1999 normal 1898 4 61.0 60.6 0.4 99 27 1917 2012 2000 1999 top-third 1959 5 55.5 55.5 0.0 91 33 1924,1926 2012 1997 2000 top-third 1901 6 50.8 50.8 0.0 97 27 1917 2012 1997 2000 top-third 1949,2007 7 47.6 47.3 0.3 98 24 1917 2012 1997 2000 top-third 8 44.5 45.3 -0.8 82 40 1917 2012 1997 2000 top-third 1911,1993 9 44.0 44.8 -0.8 83 39 1904 2012 1997 2000 top-third 10 45.1 45.4 -0.3 90 32 1918 2012 1997 2000 top-third 1942 11 46.6 47.0 -0.4 87 35 1918 2012 1997 2000 top-third 1931 12 48.5 49.0 -0.5 88 34 1918 2012 1997 2000 top-third 2019 18 49.7 49.6 0.1 99 19 1918 2012 1998 2000 top-third 2010 24 49.1 48.9 0.2 99 17 1918 2017 1998 2000 top-third 1987,1991,2016 36 49.6 48.9 0.7 104 8 1918 2012,2018 1999 2000 top-tenth 2007,2021 48 49.6 48.9 0.7 100 8 1918 2013 2000 2001 top-tenth 60 49.1 48.9 0.2 92 13 1927 2020 2000 2001 top-third 2007,2010,2018