"station_id"	"year"	"Jan"	"Feb"	"Mar"	"Apr"	"May"	"Jun"	"Jul"	"Aug"	"Sep"	"Oct"	"Nov"	"Dec"
170100	1970	    	    	    	    	    	    	    	    	    	    	    	    
170100	1971	    	    	    	    	    	    	    	    	    	    	    	    
170100	1972	    	    	    	    	    	    	    	    	    	    	    	    
170100	1973	    	    	    	    	    	    	    	    	    	    	    	    
170100	1974	    	    	    	    	    	    	    	    	    	    	    	    
170100	1975	    	    	    	    	    	    	    	    	    	    	    	    
170100	1976	    	    	    	    	    	    	    	    	    	    	    	    
170100	1977	    	    	    	    	    	    	    	    	    	    	    	    
170100	1978	    	    	    	    	    	    	    	    	    	    	    	    
170100	1979	    	    	    	    	    	    	    	    	    	    	    	    
170100	1980	    	    	    	    	    	    	    	    	    	    	    	    
170100	1981	    	    	    	    	    	    	    	    	    	    	    	    
170100	1982	    	    	    	    	    	    	    	    	    	    	  5.8	 -0.4
170100	1983	 -4.7	 -4.2	  0.8	  6.2	 10.5	 17.9	 20.2	 20.0	 17.5	  9.9	  4.4	 -3.0
170100	1984	 -6.5	 -0.9	 -3.4	  5.6	 11.9	 16.8	 20.5	 20.4	 14.4	 10.4	  5.3	 -0.5
170100	1985	 -9.3	 -3.5	 -0.4	  5.6	 11.6	 15.2	 20.1	 18.1	 15.3	  9.5	  2.7	 -5.4
170100	1986	 -4.3	 -6.4	 -0.4	  7.5	 11.3	 15.4	 18.1	 17.6	 13.4	  8.8	  1.6	 -3.5
170100	1987	 -7.2	 -6.5	 -0.6	  6.6	 12.1	 16.2	 18.7	 18.5	 14.6	  9.3	  2.2	 -3.0
170100	1988	 -6.1	 -3.8	 -1.3	  5.6	 12.3	 17.1	 20.5	 20.2	 14.3	  7.4	  4.6	 -4.5
170100	1989	 -4.2	 -5.4	 -1.3	  4.1	 13.3	 17.8	 20.3	 18.2	 15.5	 10.2	  2.5	 -9.6
170100	1990	 -1.0	 -4.4	  0.6	  5.7	 10.4	 16.3	 20.7	 20.8	 14.4	 10.7	  4.6	  0.6
170100	1991	 -4.9	 -2.0	  1.8	  7.4	 14.3	 18.2	 20.7	 20.5	 14.4	 10.0	  4.2	 -3.6
170100	1992	 -5.3	 -4.0	 -1.9	  4.2	 11.8	 17.2	 18.0	 18.8	 15.1	  8.1	  1.7	 -2.1
170100	1993	 -5.3	 -7.7	 -0.4	  6.0	 12.4	 17.1	 20.3	 20.3	 15.0	  7.2	  4.0	 -1.4