1991-2020 Degrees Fahrenheit 1 59.1 60.0 -0.9 65 64 1896 1947 1967 1966 normal 2 54.0 55.8 -1.8 38 91 1955 1934 1967 1966 bottom-third 2002 3 52.0 52.3 -0.3 73 56 1955 1934 1967 1966 normal 1963,1978 4 49.9 49.1 0.8 104 25 1955 1934 1967 1958 top-third 5 47.0 46.5 0.5 102 27 1929 1934 1967 1958 top-third 1995 6 44.8 44.6 0.2 95 30 1929 1992 1965 1967 top-third 1914 7 44.4 44.1 0.3 96 29 1929 1992 1965 1967 top-third 1953 8 45.6 45.2 0.4 99 24 1917 2016 1965 1967 top-third 1900 9 48.3 47.5 0.8 108 14 1917 2015 1966 1967 top-third 1953,1994,2005,2021 10 51.4 50.3 1.1 117 5 1917 2015 1967 1940 top-tenth 1940,2013 11 53.7 52.6 1.1 116 6 1917 2015 1967 1940 top-tenth 12 55.0 53.8 1.2 118 4 1917 2016 1967 1968 top-tenth 18 51.7 50.7 1.0 116 5 1917 2016 1967 1959 top-tenth 1959,1995,2022 24 54.5 53.8 0.7 112 7 1917 2016 1967 1941 top-tenth 2017 36 54.2 53.8 0.4 105 12 1917 2016 1967 1941 top-tenth 48 53.5 53.8 -0.3 88 27 1913 2016 1967 1942 top-third 1940,1998,1999,2003 60 53.5 53.8 -0.3 86 27 1917 2016 1967 1943 top-third 1943,1990,1996