1925-2000 Degrees Fahrenheit 1 0.6 3.7 -3.1 26 73 1942 2017 1999 2000 bottom-third 2 5.2 7.7 -2.5 21 78 1956 2002 1999 2000 bottom-third 1935,1954 3 10.7 13.6 -2.9 17 82 1956 2002 1999 2000 bottom-third 4 18.6 20.4 -1.8 22 77 1956 2002 1999 2000 bottom-third 5 25.0 26.2 -1.2 27 72 1956 2002 1999 2000 bottom-third 1966 6 29.5 30.6 -1.1 24 75 1956 2002 1999 2000 bottom-third 1935,1966 7 32.5 33.3 -0.8 29 70 1956 2017,2019 1999 2000 bottom-third 8 32.6 33.8 -1.2 17 82 1956 2019 1996 2000 bottom-third 1935,1966,1971,2012 9 31.7 32.7 -1.0 19 80 1955,1956 2019 1996 2000 bottom-third 1935,1939,1959,1968,1974 10 29.8 30.5 -0.7 25 74 1956 2019 1999 2000 bottom-third 1932,1942 11 28.4 28.1 0.3 45 54 1956 2019 1999 2000 normal 1931 12 27.3 26.0 1.3 69 30 1956 2019 1999 2000 top-third 18 29.1 27.5 1.6 75 23 1956 2019 2000 1998 top-third 2010 24 27.9 26.0 1.9 81 17 1956 2019 2000 1998 top-third 36 26.6 26.0 0.6 56 41 1956 2016 1996 2000 normal 1930,1931,1959,2009 48 27.0 25.9 1.1 67 29 1974 2019 1999 2000 top-third 1940,1942,1983,1988,1994 60 27.3 25.9 1.4 74 21 1975 2019 2000 1997 top-third