1901-2000 Degrees Fahrenheit 1 47.8 45.8 2.0 100 29 1912 2022 1989 1991 top-third 1984 2 52.1 49.9 2.2 106 23 1912 2022 1989 1991 top-third 1969,1994 3 53.1 51.9 1.2 97 32 1912 2022 1989 1991 top-third 1897,1904,1917,1988 4 52.4 51.0 1.4 97 32 1907 2021 1991 1990 top-third 1922,1998,2000 5 51.2 49.0 2.2 114 15 1907 2021 1991 1931 top-third 1931 6 49.1 46.3 2.8 123 6 1912 2021 1991 1992 top-tenth 2014,2020 7 46.7 43.6 3.1 126 3 1944 2015 1991 1992 top-tenth 2021 8 44.5 41.1 3.4 126 3 1933,1944,1964 2015 1991 1992 top-tenth 9 41.7 38.6 3.1 125 4 1917 2015 1991 1992 top-tenth 10 39.6 36.8 2.8 124 4 1933 2015 1991 1992 top-tenth 11 38.6 35.8 2.8 124 4 1917 2015 1991 1992 top-tenth 2003,2022 12 38.6 35.9 2.7 125 3 1917 2015 1991 1992 top-tenth 18 41.2 39.3 1.9 115 13 1917 2015 1991 1940 top-tenth 24 37.0 35.9 1.1 98 29 1949 2016 1991 1987 top-third 1995,2002 36 37.0 35.9 1.1 101 25 1950 2017 1991 1988 top-third 2000 48 36.9 35.9 1.0 97 28 1950 2018 1991 1989 top-third 1996 60 36.9 35.8 1.1 97 27 1949,1950 2018 1991 1990 top-third 1982