1991-2020 Degrees Fahrenheit 1 39.0 31.2 7.8 125 3 1899 1954 1991 1954 top-tenth 2 35.6 29.9 5.7 123 3 1949 1999 1991 1954 top-tenth 3 34.8 29.2 5.6 124 1 1979 1992 1991 1992 highest 4 34.6 31.3 3.3 116 6 1979 2000 1991 1981 top-tenth 5 37.4 35.0 2.4 112 8 1979 2000 1991 1981 top-tenth 6 41.8 39.8 2.0 111 8 1979 1954 1991 1981 top-tenth 2006 7 46.5 44.6 1.9 111 8 1979 1999 1991 1981 top-tenth 8 50.1 48.5 1.6 111 8 1979 1999 1991 1981 top-tenth 9 52.3 50.7 1.6 109 9 1929 2022 1991 1981 top-tenth 10 53.1 51.4 1.7 109 9 1913 2022 1991 1981 top-tenth 1935,1995 11 52.5 51.1 1.4 107 10 1908,1913,1929 2013 1991 1981 top-tenth 1934 12 51.5 50.2 1.3 109 8 1913 2013 1991 1964 top-tenth 1954,1964 18 47.7 46.7 1.0 102 10 1913 2000 1991 1982 top-tenth 24 50.7 50.2 0.5 93 17 1913 2000 1991 1982 top-third 2004 36 50.6 50.2 0.4 94 12 1910 2002 1991 1992 top-third 2007,2008,2015,2017 48 50.5 50.3 0.2 89 13 1918 2002 1991 1992 top-third 2015,2019 60 50.2 50.2 0.0 82 16 1913 2002,2003 1991 1992 top-third 2000