1991-2020 Degrees Fahrenheit 1 2.9 10.0 -7.1 22 75 1917 1998 1917 1922 bottom-third 2 3.4 7.7 -4.3 38 57 1917 1998 1920 1922 normal 3 3.5 9.1 -5.6 27 64 1979 1998 1920 1922 bottom-third 2022 4 9.8 13.4 -3.6 39 50 1979 2002 1922 1921 normal 5 16.3 19.1 -2.8 35 53 1920 2012 1920 1922 normal 1973,1990,2018 6 23.3 25.0 -1.7 44 42 1920 1998 1920 1922 normal 7 29.1 30.5 -1.4 48 37 1920 2002 1922 1921 normal 8 33.3 34.8 -1.5 41 44 1920 2002,2012 1920 1922 normal 1969 9 36.5 37.8 -1.3 41 42 1959 2002 1916 1922 normal 1953,1961,1990 10 38.6 39.2 -0.6 53 30 1951,1959 2002 1916 1922 normal 2001 11 38.4 39.1 -0.7 49 34 1951 2002 1916 1922 normal 1989 12 37.0 37.9 -0.9 49 32 1951 2002 1916 1922 normal 18 32.5 33.6 -1.1 49 30 1951 2017 1921 1922 normal 1976,1981,1989 24 37.4 37.9 -0.5 54 22 1952 2017 1916 1922 top-third 36 37.8 37.8 0.0 56 15 1952 2000 1916 1923 top-third 2019 48 -99 37.8 -99 -99 -99 1952 2002 normal 60 -99 37.7 -99 -99 -99 1953 2002 normal