1991-2020 Degrees Fahrenheit 1 28.9 22.4 6.5 81 12 1936 1954 1934 1935 top-third 2 21.7 20.3 1.4 69 24 1936 1987 1933 1934 top-third 1933 3 20.8 21.0 -0.2 57 35 1936 1992 1933 1934 normal 4 24.9 24.4 0.5 63 29 1936 2002 1933 1934 top-third 2007 5 30.5 29.5 1.0 68 24 1936 2002 1934 1935 top-third 6 34.8 35.3 -0.5 54 37 1936 2002 1933 1934 normal 1990 7 40.0 40.5 -0.5 49 42 1936 2002 1933 1934 normal 2015 8 44.6 44.8 -0.2 54 37 1936 2002 1933 1934 normal 1953,1984,1989,2007,2009 9 47.8 47.5 0.3 62 29 1936 2002 1933 1934 top-third 1991 10 50.2 48.7 1.5 78 13 1936 2002 1934 1934 top-third 1934,1954 11 50.1 48.6 1.5 78 13 1936 2002 1934 1935 top-third 12 48.7 47.5 1.2 78 13 1936,1994 2013,2017 1934 1935 top-third 1989,2005,2021 18 44.6 43.4 1.2 76 13 1979 2017 1934 1935 top-third 24 48.7 47.5 1.2 81 8 1952 2017 1934 1935 top-tenth 2023 36 48.0 47.5 0.5 72 15 1952,1953 2018 1935 1935 top-third 2019 48 -99 47.5 -99 -99 -99 1952,1997 2008,2018 normal 60 -99 47.5 -99 -99 -99 1997 2006,2017 normal