1991-2020 Degrees Fahrenheit 1 38.6 39.0 -0.4 64 38 1960 2012 1947 1946 normal 2 31.3 34.9 -3.6 26 76 1934 2012 1947 1946 bottom-third 3 27.0 32.7 -5.7 9 91 1978 2012 1940 1947 bottom-tenth 1963 4 27.3 32.9 -5.6 7 93 1978 2012 1934 1947 bottom-tenth 1961 5 29.4 34.8 -5.4 5 93 1934 2012 1934 1947 bottom-tenth 6 34.1 37.8 -3.7 14 83 1934 2012 1944 1947 bottom-third 7 38.3 41.6 -3.3 16 81 1934 2012 1944 1947 bottom-third 8 42.6 45.4 -2.8 21 76 1934,1963 2012 1944 1947 bottom-third 9 45.8 48.6 -2.8 21 76 1963 2012 1944 1947 bottom-third 10 47.8 50.6 -2.8 17 80 1934,1963 2012 1941 1947 bottom-third 1979 11 48.6 51.5 -2.9 16 81 1941 2012 1941 1947 bottom-third 12 48.4 51.4 -3.0 12 85 1941 2012 1944 1947 bottom-third 1944,1959,1993 18 44.4 46.8 -2.4 19 74 1941 2017 1946 1947 bottom-third 1946,1957 24 48.9 51.4 -2.5 17 76 1926,1941 2017 1944 1947 bottom-third 36 49.1 51.3 -2.2 15 74 1941 2018,2022 1946 1947 bottom-third 1940,1945,1946,1959,1971,1972 48 49.2 51.3 -2.1 18 68 1941,1980 2023 1947 1947 bottom-third 1947,1967,1973,1982 60 49.0 51.2 -2.2 11 72 1944 2020 1945 1947 bottom-third 1942,1945,1966,1969,1972,1979,1982