1925-2000 Degrees Fahrenheit 1 6.4 2.2 4.2 63 37 2012 1981 1944 1945 normal 2 5.5 3.0 2.5 62 37 1934 2001 1943 1945 normal 3 4.3 5.9 -1.6 25 74 1943 2001 1943 1945 bottom-third 1967 4 9.8 10.8 -1.0 31 68 1934 2003 1943 1945 bottom-third 1964,1996 5 15.8 16.7 -0.9 31 68 1934 2003 1943 1945 bottom-third 1954 6 21.2 22.2 -1.0 26 73 1934 2003 1943 1945 bottom-third 1991 7 25.6 26.6 -1.0 26 73 1934 2003 1943 1945 bottom-third 1932 8 28.3 29.4 -1.1 21 78 1934 2003 1943 1945 bottom-third 2000 9 28.9 30.3 -1.4 18 81 1934 2003 1943 1945 bottom-third 1974 10 28.0 29.6 -1.6 14 85 1956 2018 1943 1945 bottom-third 1943,1969 11 26.3 27.9 -1.6 14 85 1956 2016 1943 1945 bottom-third 1933,1943,1960 12 25.0 26.0 -1.0 22 77 1956 2020 1934 1945 bottom-third 2009 18 25.2 24.7 0.5 52 46 1957,1972 2020 1944 1945 normal 1954,1964,1992 24 26.7 26.0 0.7 60 38 1957 2017 1940 1945 normal 1936,1991,1998 36 27.2 25.9 1.3 71 26 1957 2017,2018 1944 1945 top-third 1944,1999 48 26.8 25.9 0.9 58 38 1975 2020 1941 1945 normal 60 27.0 25.9 1.1 68 27 1976 2020 1943 1945 top-third 1930,1984,1985,2010,2014