"station_id" "year" "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec" 198757 1970 198757 1971 198757 1972 3.4 198757 1973 20.6 22.4 22.7 16.6 10.9 5.5 2.3 198757 1974 -1.3 -2.5 3.3 10.4 12.6 18.3 21.8 21.5 16.8 8.7 5.6 0.7 198757 1975 -0.2 -2.0 1.6 6.5 16.3 18.9 22.9 21.1 15.4 12.0 8.2 -0.3 198757 1976 -4.6 1.6 3.8 11.3 14.4 21.2 21.6 21.0 16.2 9.5 3.3 -3.8 198757 1977 -6.7 -2.4 5.9 9.6 16.1 18.2 22.5 21.8 16.7 11.0 6.9 -1.2 198757 1978 -3.8 -5.5 0.7 7.6 14.5 19.1 21.8 21.6 15.2 10.5 4.8 0.3 198757 1979 -1.3 -5.7 4.9 8.1 15.9 18.7 22.9 21.0 16.9 10.9 8.4 1.8 198757 1980 -2.2 -3.4 2.3 9.6 14.7 18.0 23.1 22.3 18.1 9.9 4.3 -2.7 198757 1981 -7.0 2.0 3.2 10.1 15.2 19.9 22.4 20.8 15.8 9.1 5.1 -1.0 198757 1982 -5.8 -1.7 2.3 7.6 14.5 17.1 22.2 19.7 16.9 10.3 7.5 2.5 198757 1983 -2.1 -0.8 4.1 8.8 13.4 20.2 23.3 21.9 18.6 10.8 6.2 -1.0 198757 1984 -3.8 2.0 -0.4 7.8 13.8 20.4 22.1 22.3 15.5 12.0 5.8 2.2 198757 1985 -5.9 -0.7 4.2 9.4 15.0 17.4 22.3 20.8 17.4 11.6 6.0 -2.1 198757 1986 -1.1 -3.0 4.2 9.0 14.8 18.0 21.1 20.0 16.0 10.6 4.1 0.7 198757 1987 -3.3 -2.6 3.1 8.3 15.0 20.1 22.5 20.4 16.9 9.9 5.0 0.8 198757 1988 -3.0 -1.2 3.6 7.8 14.5 19.3 23.5 23.7 16.3 8.7 6.6 -0.9 198757 1989 -0.2 -1.9 2.3 7.3 15.5 19.7 21.8 21.3 17.1 11.0 4.7 -7.0 198757 1990 1.2 0.6 4.0 8.5 12.5 19.1 22.2 21.7 16.7 13.3 7.2 3.2 198757 1991 -2.7 0.7 4.5 10.5 17.4 19.7 22.3 22.3 16.0 12.3 6.0 1.0 198757 1992 -1.6 -0.7 1.3 7.3 13.7 19.2 20.5 20.5 16.5 9.7 4.2 -0.1 198757 1993 -1.6 -4.4 1.0 8.7 15.8 19.8 22.5 22.7 17.4 9.9 5.8 -0.4