"station_id" "year" "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec" 170934 1970 -9.1 -5.1 -0.7 6.2 13.7 16.8 21.0 20.5 15.2 11.2 4.5 -6.7 170934 1971 -7.3 -3.5 -0.2 3.9 11.4 18.5 20.3 20.6 17.0 12.6 1.9 -2.4 170934 1972 -4.7 -5.9 -1.9 4.9 11.7 15.7 20.4 19.8 7.6 2.1 -4.3 170934 1973 -5.3 2.7 7.4 9.9 18.1 21.4 21.3 14.7 9.6 2.7 170934 1974 -4.5 -4.9 -0.4 6.1 9.2 16.6 20.4 20.2 14.8 3.5 -2.1 170934 1975 -3.9 -4.5 -1.3 4.3 13.9 17.0 20.7 19.8 14.0 9.9 6.0 -4.3 170934 1976 -7.6 -3.7 -1.2 7.1 11.5 18.7 19.0 19.6 15.5 8.7 2.3 -5.9 170934 1977 -9.1 -5.3 2.9 6.0 13.0 15.8 20.2 19.2 14.1 8.3 170934 1978 -6.8 16.6 19.8 19.8 13.3 8.3 170934 1979 -4.1 -7.4 2.5 17.6 21.5 -1.4 170934 1980 12.3 16.5 21.1 9.1 2.1 -5.1 170934 1981 -7.8 170934 1982 15.4 20.8 18.3 15.5 9.1 5.1 -0.5 170934 1983 -3.9 -2.8 2.7 7.4 11.2 18.2 20.7 20.3 17.6 9.2 9.3 4.5 170934 1984 -3.4 -6.7 -0.1 -2.3 6.4 11.6 17.7 21.0 21.8 14.5 9.3 3.9 170934 1985 -0.9 -8.2 -2.1 2.2 6.8 11.8 15.6 20.0 18.7 15.1 9.3 3.1 170934 1986 -5.1 -4.8 -5.6 0.7 8.4 13.0 16.1 19.9 19.5 14.4 9.0 2.2 170934 1987 -1.4 -5.5 -4.6 1.5 8.4 13.2 18.1 19.4 15.6 9.1 3.1 -1.4 170934 1988 -3.5 1.0 6.4 12.2 17.0 21.4 21.5 15.3 8.4 5.0 -3.5 170934 1989 -3.5 -4.7 0.3 5.9 13.9 17.9 20.8 20.1 15.5 10.0 2.6 -9.2 170934 1990 -1.8 -3.9 1.6 7.4 12.1 17.3 21.3 21.6 16.0 11.9 5.5 0.2 170934 1991 -5.9 -2.6 1.9 7.4 14.4 18.6 21.5 21.2 14.8 10.7 5.0 -4.0 170934 1992 -4.6 -3.1 -0.3 12.0 17.8 18.9 19.9 15.4 8.7 3.3 -1.3 170934 1993 -4.4 -7.5 -0.6 6.9 13.6 18.1 21.8 21.3 16.0 8.4 4.3 -0.4