1901-2000 Degrees Fahrenheit 1 41.8 36.5 5.3 112 18 1978 2017 1948 1938 top-third 2 42.0 35.1 6.9 125 5 1978 1932,2023 1948 1932 top-tenth 3 41.0 35.5 5.5 125 4 1978 1932 1948 1932 top-tenth 4 42.9 38.0 4.9 125 4 1977 1932 1948 1932 top-tenth 5 45.0 41.8 3.2 119 10 1977 1932 1948 1932 top-tenth 6 49.0 46.3 2.7 119 10 1977 1932 1948 1932 top-tenth 7 52.5 50.3 2.2 115 14 1977 1932 1948 1937 top-third 2019 8 55.5 53.6 1.9 113 16 1977 1932 1948 1937 top-third 2002,2019 9 57.5 55.7 1.8 111 18 1977 1932 1948 1937 top-third 10 58.1 56.6 1.5 110 19 1977 1932 1948 1937 top-third 1909,2002,2006 11 58.2 56.4 1.8 113 16 1977 1932 1948 1937 top-third 12 57.4 55.5 1.9 116 13 1977 2017 1948 1939 top-tenth 1909,1939 18 53.6 52.4 1.2 106 22 1978 2017 1948 1943 top-third 1939,1943,1954 24 56.0 55.5 0.5 77 51 1978 2017 1948 1947 normal 1914 36 56.2 55.5 0.7 92 35 1979 2018 1948 1944 top-third 1957,1993 48 56.2 55.5 0.7 94 32 1980 2019,2020 1948 1940 top-third 1938,1992,2000,2003 60 56.0 55.5 0.5 80 45 1981 2020 1948 1947 normal 1940,1953,1958