1991-2020 Degrees Fahrenheit 1 39.8 41.1 -1.3 27 49 1967 2011 1968 1966 normal 2012 2 45.1 46.3 -1.2 26 50 1972 1963 1967 1968 normal 3 50.6 51.8 -1.2 24 52 1972 2011 1967 1968 bottom-third 1952,1995 4 55.7 56.4 -0.7 36 40 1972 2011 1967 1968 normal 5 58.4 59.4 -1.0 27 49 1976 2011 1967 1968 normal 2014 6 59.8 60.5 -0.7 30 46 1972 2020 1967 1968 normal 1966,2014 7 59.4 60.1 -0.7 32 43 1972 2015,2022 1968 1963 normal 1957,1995,2004,2014 8 58.2 58.5 -0.3 48 26 1972 2010 1968 1959 normal 1983,2013 9 55.2 55.9 -0.7 34 40 1972 2010 1966 1968 normal 1985,1995,2009 10 52.3 53.1 -0.8 33 41 1972 2012 1968 1961 normal 11 49.7 50.6 -0.9 35 38 1972,1978 2012 1968 1959 normal 1984 12 47.6 49.0 -1.4 24 49 1978 2012 1968 1960 bottom-third 1959,1960,1980 18 51.7 52.8 -1.1 27 46 1978 2012 1968 1960 normal 1980 24 47.6 49.0 -1.4 20 50 1972,1978 2017 1966 1960 bottom-third 1956,1958,1960,1986 36 -99 49.0 -99 -99 -99 1972 2012,2022 normal 48 -99 49.0 -99 -99 -99 1965,1972 2013 normal 60 -99 48.9 -99 -99 -99 1965,1966,1972 2020 normal