1991-2020 Degrees Fahrenheit 1 72.6 74.0 -1.4 13 61 2017 2015 1950 1952 bottom-third 1973,1997 2 74.0 75.2 -1.2 9 65 2017 2015 1950 1952 bottom-third 1973,1981,1990 3 75.2 76.4 -1.2 10 64 1955 2015 1952 1952 bottom-third 1952,1973,1999 4 76.2 77.3 -1.1 11 63 1955 2019 1952 1951 bottom-third 1958,1969,2017 5 76.8 77.9 -1.1 9 65 1955 2019 1952 1951 bottom-third 1962,1985 6 77.0 78.2 -1.2 8 66 1955 2019 1952 1951 bottom-third 1958,1973 7 77.1 78.2 -1.1 9 65 1955 2019 1952 1951 bottom-third 8 77.1 78.0 -0.9 11 63 1955 2019 1952 1951 bottom-third 1954,1969 9 76.8 77.6 -0.8 12 62 1955 2019 1952 1951 bottom-third 1956,1969,1985 10 76.3 77.2 -0.9 12 62 1955 2019 1952 1951 bottom-third 1969 11 76.0 76.7 -0.7 17 57 1955 1984 1952 1951 bottom-third 1956 12 75.6 76.3 -0.7 14 59 1955 1984 1952 1951 bottom-third 1957,1987 18 76.0 77.0 -1.0 5 68 1955 2020 1952 1952 bottom-tenth 1952,1958,1999,2009 24 75.3 76.3 -1.0 3 69 1955 2020 1953 1952 bottom-tenth 1958,1973,1999 36 75.5 76.3 -0.8 5 66 1955 2020,2021 1953 1953 bottom-tenth 1958,1999 48 -99 76.3 -99 -99 -99 1955 2020 normal 60 -99 76.3 -99 -99 -99 1955,1956,1958 2019,2020,2021 normal