1991-2020 Degrees Fahrenheit 1 71.8 74.4 -2.6 40 82 1987 2015 1919 1924 bottom-third 2 69.8 72.2 -2.4 38 83 1931 2015 1924 1923 bottom-third 1902 3 68.2 70.4 -2.2 46 74 1958 2023 1924 1923 normal 1954 4 68.0 68.8 -0.8 67 48 1958 2023 1924 1923 normal 1912,1930 5 67.8 68.5 -0.7 71 40 1958 2023 1924 1923 normal 1950,1998,2006 6 67.8 68.9 -1.1 62 47 1958 2023 1924 1923 normal 1959,2001 7 68.7 70.2 -1.5 47 62 1958 2020 1924 1923 normal 1903,1908,1917,1959,1962,2001 8 70.2 71.6 -1.4 47 61 1958 2020 1924 1923 normal 1976,1992,2009 9 71.6 72.9 -1.3 48 60 1958 2020 1924 1923 normal 1930,1976,1992,2001 10 72.6 73.9 -1.3 47 61 1958 2020,2023 1924 1923 normal 1945,1953,1965,1992 11 73.4 74.6 -1.2 48 60 1958,1977 2020,2023 1924 1923 normal 1934,1992 12 73.7 75.0 -1.3 45 63 1977 2020,2023 1924 1923 normal 1927,1944,1959,2010 18 71.2 72.8 -1.6 31 66 1978 2023 1914 1924 bottom-third 1960 24 73.1 74.9 -1.8 22 74 1978 2021,2023 1911 1924 bottom-third 1951 36 73.4 74.8 -1.4 27 59 1970,1971 2022 1921 1924 bottom-third 1908,1927,1952,1953,1981 48 73.6 74.7 -1.1 33 45 1969,1970,1971 2023 1924 1923 normal 1983,1984 60 73.5 74.7 -1.2 27 46 1970 2023 1914 1924 normal 1954,1974,1977