1991-2020 Degrees Fahrenheit 1 30.1 26.7 3.4 79 13 1959 2016 1986 1981 top-third 2 33.9 34.1 -0.2 52 39 1919 1963 1986 1984 normal 1909,1913,1958 3 41.0 41.0 0.0 58 31 1919 1963,2016 1986 1983 normal 4 46.2 46.6 -0.4 50 38 1951 2021 1986 1984 normal 5 50.3 50.3 0.0 59 29 1951 2021 1986 1983 top-third 1921,1960,1990,2003 6 52.5 52.1 0.4 61 25 1985 2021 1986 1983 top-third 2000,2013 7 52.8 52.1 0.7 64 22 1950 2021 1986 1983 top-third 1921 8 52.1 50.4 1.7 79 7 1950 2021 1986 1963 top-tenth 2006,2015 9 49.5 47.4 2.1 77 7 1950 2021 1986 1963 top-tenth 2012 10 46.8 43.7 3.1 82 2 1950 1998 1986 1987 top-tenth 11 43.5 40.2 3.3 80 4 1950 1998 1986 1987 top-tenth 12 41.1 37.8 3.3 79 4 1950 1998 1986 1987 top-tenth 2016 18 43.9 42.6 1.3 70 9 1951 1998,2012,2016 1986 1921 top-third 2002,2017 24 38.7 37.8 0.9 62 14 1951 1999 1986 1987 top-third 2011 36 37.3 37.8 -0.5 50 21 1951 2000 1986 1983 top-third 48 37.1 37.7 -0.6 40 26 1952 2001 1986 1984 normal 2011 60 37.6 37.7 -0.1 44 18 1954 2002 1986 1987 top-third 2015