1991-2020 Degrees Fahrenheit 1 43.6 43.3 0.3 45 30 1960 2012 1954 1953 normal 2 38.8 39.5 -0.7 39 36 1978 2012 1951 1954 normal 1961 3 36.3 37.5 -1.2 36 39 1978 2023 1948 1954 normal 1957 4 36.0 37.6 -1.6 34 40 1978 2012 1951 1954 normal 5 37.5 39.5 -2.0 26 47 1978 2012 1951 1954 normal 1951,1987 6 41.2 42.4 -1.2 35 38 1978 2002,2012 1951 1954 normal 1960,2004 7 45.1 46.2 -1.1 32 41 1977 2016 1951 1954 normal 1962 8 48.6 49.9 -1.3 30 43 1977 2016 1951 1954 normal 1980 9 51.7 53.0 -1.3 30 43 1977 2012 1951 1954 normal 1957 10 53.8 54.9 -1.1 34 39 1977 2012 1951 1954 normal 1962,1975 11 54.5 55.7 -1.2 32 41 1977 2012 1951 1954 normal 1973,1975,1996 12 54.6 55.5 -0.9 35 38 1968 2012,2020 1951 1954 normal 1956 18 50.5 51.1 -0.6 42 27 1978 2017,2023 1951 1954 normal 1975,1995 24 55.0 55.5 -0.5 44 25 1978 2017 1951 1954 normal 1975,1998,2001 36 55.2 55.4 -0.2 47 18 1979 2022 1951 1955 top-third 2004,2006 48 -99 55.4 -99 -99 -99 1970,1980 2023 normal 60 -99 55.3 -99 -99 -99 1970 2020,2023 normal