1901-2000 Degrees Fahrenheit 1 60.4 55.0 5.4 123 6 1953 1992,2001 1939 1934 top-tenth 2 54.2 50.8 3.4 120 9 1975 1992 1939 1936 top-tenth 1936 3 50.3 47.0 3.3 119 10 1917 1934 1939 1934 top-tenth 2015 4 46.8 43.8 3.0 117 12 1933 1934 1939 1934 top-tenth 5 44.0 41.0 3.0 121 8 1917 1934 1939 1934 top-tenth 2012 6 42.9 39.4 3.5 124 4 1917 1934 1939 1934 top-tenth 1986 7 42.7 39.3 3.4 123 5 1917 1934 1939 1934 top-tenth 1996,2018 8 43.6 40.8 2.8 122 6 1917 1934 1939 1934 top-tenth 2018 9 45.7 43.1 2.6 122 6 1917 1934 1939 1934 top-tenth 10 48.3 45.8 2.5 120 8 1917 1934 1939 1934 top-tenth 11 50.6 48.2 2.4 120 8 1917 1934 1939 1934 top-tenth 1996,2022 12 51.7 49.5 2.2 116 12 1917 1934 1939 1934 top-tenth 18 47.7 46.1 1.6 107 20 1917 2015 1939 1935 top-third 1982,1987,2003 24 50.5 49.5 1.0 97 30 1917 2015 1939 1935 top-third 1987,1989,2006 36 50.5 49.5 1.0 101 25 1917 2016,2017 1939 1936 top-third 1941,1961,1990 48 49.8 49.5 0.3 77 48 1917 2018 1939 1937 normal 1927,1929,1930,1942,1959,1984 60 49.8 49.5 0.3 77 47 1917 2018 1939 1938 normal 1927,1929,1931,1936,1944,1954,1960,1988