1991-2020 Degrees Fahrenheit 1 38.6 36.8 1.8 64 20 2019 2015 1999 1994 top-third 2 35.5 32.4 3.1 71 13 2019 2015 1999 1992 top-third 1984 3 32.6 29.4 3.2 71 13 1949 2015 1998 1999 top-third 4 31.3 27.8 3.5 74 9 1949 2016 1999 1992 top-third 5 33.6 29.0 4.6 82 1 1949 2000 1999 2000 highest 6 36.1 31.8 4.3 81 1 1949 2000 1999 2000 highest 7 39.0 35.8 3.2 80 2 1949 2016 1999 2000 top-tenth 8 43.0 40.0 3.0 80 2 1949 2016 1999 2000 top-tenth 9 45.8 43.4 2.4 79 3 1949 2016 1999 2000 top-tenth 10 47.3 45.4 1.9 78 4 1949 2016 1999 2000 top-tenth 11 47.8 46.2 1.6 78 4 1949 2016 1999 1999 top-tenth 1941,1999,2007 12 47.4 46.1 1.3 74 8 1949 2016 1998 1999 top-tenth 18 42.9 41.3 1.6 73 5 1952 2013 1999 2000 top-tenth 24 47.6 46.0 1.6 75 3 1952 2017 1999 2000 top-tenth 2022 36 47.0 46.0 1.0 69 5 1951,1952 2018 1999 2000 top-tenth 48 46.2 46.0 0.2 58 12 1952 2008,2009 1999 1992 top-third 1992 60 45.6 46.0 -0.4 45 21 1952 2008 1999 1995 top-third 1994,1995