1991-2020 Degrees Fahrenheit 1 41.8 39.0 2.8 90 12 1960 2012 1994 1977 top-third 2 33.7 34.9 -1.2 59 43 1934 2012 1994 1992 normal 1992 3 33.1 32.7 0.4 79 21 1978 2012 1994 1991 top-third 1946,1983,2022 4 33.8 32.9 0.9 82 18 1978 2012 1994 1991 top-third 1997 5 36.2 34.8 1.4 85 13 1934 2012 1994 1991 top-third 6 38.7 37.8 0.9 82 15 1934 2012 1994 1991 top-third 1983 7 42.2 41.6 0.6 79 18 1934 2012 1994 1991 top-third 8 45.5 45.4 0.1 76 21 1934,1963 2012 1994 1991 top-third 1949,1974,1985 9 48.9 48.6 0.3 77 20 1963 2012 1994 1991 top-third 10 51.2 50.6 0.6 82 15 1934,1963 2012 1994 1932 top-third 11 51.7 51.5 0.2 79 18 1941 2012 1994 1992 top-third 1992 12 51.8 51.4 0.4 80 17 1941 2012 1994 1932 top-third 2007 18 45.6 46.8 -1.2 56 37 1941 2017 1994 1992 normal 1956,1958,1975,1985,1990,2001 24 50.4 51.4 -1.0 60 33 1926,1941 2017 1994 1992 normal 1953,2004 36 49.7 51.3 -1.6 34 55 1941 2018,2022 1994 1993 normal 1934,1939,1957,1958,1983 48 50.2 51.3 -1.1 53 33 1941,1980 2023 1994 1993 normal 1953,1954,1987,1988 60 50.4 51.2 -0.8 56 27 1944 2020 1994 1993 top-third 1993