1991-2020 Degrees Fahrenheit 1 74.7 75.2 -0.5 29 38 1976 1979 1952 1951 normal 2 78.8 79.6 -0.8 23 44 1976 1977 1953 1952 normal 3 82.8 83.2 -0.4 33 34 1976 1951 1953 1952 normal 4 85.7 84.9 0.8 52 15 1976 1951 1953 1952 top-third 2009 5 87.3 85.5 1.8 62 5 1976 1951 1952 1951 top-tenth 6 86.9 85.0 1.9 62 5 1976 1951 1952 1951 top-tenth 7 85.5 83.6 1.9 61 5 1976 2011 1952 1953 top-tenth 8 83.9 81.7 2.2 64 2 1976 2011 1952 1953 top-tenth 9 81.2 79.4 1.8 62 3 1987 2000,2011 1952 1953 top-tenth 10 79.1 77.1 2.0 62 3 1987 2000 1952 1953 top-tenth 11 76.9 75.2 1.7 62 3 1987 2000 1952 1953 top-tenth 12 75.6 74.2 1.4 61 4 1987 2000 1952 1953 top-tenth 2006 18 78.9 77.8 1.1 59 6 1977 2000 1953 1952 top-tenth 1954,2022 24 75.2 74.2 1.0 59 4 1988 2000 1953 1953 top-tenth 36 -99 74.2 -99 -99 -99 1970 2000 normal 48 -99 74.2 -99 -99 -99 1971 1956 normal 60 -99 74.2 -99 -99 -99 1977,1979 1956 normal