1991-2020 Degrees Fahrenheit 1 58.0 54.5 3.5 80 3 2011 1958 1992 1958 top-tenth 2 53.3 51.3 2.0 75 8 2011 2016 1991 1992 top-tenth 1949 3 50.4 48.9 1.5 70 13 1955 2016 1991 1992 top-third 1949,1994 4 47.3 46.9 0.4 56 27 1955 2016 1991 1992 top-third 1944,1966,2007 5 44.7 45.4 -0.7 31 52 1950 1992,2016 1991 1992 normal 1957 6 43.3 44.3 -1.0 20 63 1950 1958 1991 1992 bottom-third 1962,1975,1999 7 43.3 44.1 -0.8 23 60 1950 1992 1991 1992 bottom-third 1969 8 44.2 44.9 -0.7 23 60 1950 2015 1991 1992 bottom-third 9 45.7 46.5 -0.8 19 64 1949 2015 1991 1992 bottom-third 1948,1957,1969,1976 10 47.5 48.2 -0.7 23 60 1949 2015 1991 1992 bottom-third 1952,1957,1991 11 49.1 49.7 -0.6 24 59 1949 2015 1991 1992 bottom-third 1979,1991 12 50.2 50.5 -0.3 30 53 1955 2015,2016 1991 1992 normal 1997,2000,2006 18 49.2 48.4 0.8 72 10 1956 2016 1992 1968 top-third 24 51.0 50.5 0.5 70 12 1956 2016 1992 1983 top-third 1945,1981,1982,2019,2021 36 50.6 50.4 0.2 53 28 1957 2016,2017 1992 1992 normal 1992,1996,1999,2000,2007 48 50.5 50.4 0.1 49 31 1957 2018 1992 1984 normal 1959,1964,1967,1994,1996,1997,2000 60 50.3 50.4 -0.1 32 47 2012 2018,2019 1991 1992 normal 1965,1978,1979,1987,1991