1991-2020 Degrees Fahrenheit 1 48.3 50.1 -1.8 32 65 1967 1934 1958 1960 bottom-third 2 46.3 47.2 -0.9 41 56 1955 1934 1960 1959 normal 3 45.3 44.2 1.1 81 16 1936 1934 1960 1947 top-third 2000,2003 4 42.8 41.9 0.9 81 16 1950 1934 1960 1953 top-third 2000,2021 5 39.9 40.3 -0.4 61 35 1950 1934 1960 1958 normal 1987 6 40.0 40.3 -0.3 62 34 1937 1934 1960 1958 normal 1982,2007 7 41.7 41.9 -0.2 62 34 1936 1934 1960 1958 normal 1938,1964,1989 8 44.3 44.7 -0.4 57 39 1949 1934 1960 1958 normal 1946,1954,2007 9 46.8 47.7 -0.9 49 47 1949 1934,2015 1960 1959 normal 1997 10 49.8 50.2 -0.4 62 34 1949 2015 1960 1959 normal 1981,2012 11 51.2 51.5 -0.3 62 34 1949 2016 1960 1959 normal 1987 12 51.4 52.1 -0.7 56 40 1949 2016 1960 1959 normal 1938 18 46.5 48.1 -1.6 33 62 1930,1950 2016 1960 1959 normal 1974 24 50.2 52.0 -1.8 20 75 1950 2016 1957 1960 bottom-third 1977,1978 36 51.1 52.0 -0.9 48 46 1957 2016 1958 1960 normal 1967,1976 48 51.2 52.0 -0.8 55 38 1932 2018 1960 1943 normal 1940,1943,1967,1971,1983,2011,2012 60 50.8 52.0 -1.2 43 49 1933 2018,2019 1960 1944 normal 1976