1991-2020 Degrees Fahrenheit 1 41.3 38.7 2.6 88 14 1960 2012 1928 1929 top-third 2 34.3 34.6 -0.3 65 37 1934 2012 1928 1927 normal 3 31.6 32.4 -0.8 60 40 1978 2012,2020 1928 1927 normal 4 31.9 32.6 -0.7 65 35 1978 2012 1928 1929 normal 1933,1957 5 33.8 34.5 -0.7 64 34 1934 2012 1928 1929 normal 1989 6 36.8 37.5 -0.7 65 32 1934 2012 1928 1929 top-third 1942,1950 7 39.9 41.3 -1.4 54 43 1934 2012 1926 1928 normal 1952,1957,1973,2009 8 43.8 45.1 -1.3 57 40 1963 2012 1928 1929 normal 1933,1986 9 46.9 48.3 -1.4 56 41 1963 2012 1928 1929 normal 1969,1981,1986,2009 10 48.6 50.3 -1.7 43 54 1963 2012 1928 1929 normal 1931,1955,1958,1967 11 49.3 51.2 -1.9 35 62 1941 2012 1928 1929 normal 1939,1969,1980,1988,2014 12 48.9 51.1 -2.2 25 72 1941 2012 1928 1929 bottom-third 1930,1964,1971,1996 18 44.7 46.5 -1.8 34 59 1941 2017 1926 1929 normal 1931,1942 24 48.4 51.0 -2.6 10 83 1926,1941 2017,2021 1926 1929 bottom-third 1963,1969,1971 36 -99 51.0 -99 -99 -99 1941,1979 2022 normal 48 -99 50.9 -99 -99 -99 1980 2023 normal 60 -99 50.9 -99 -99 -99 1944 2023 normal