"station_id"	"year"	"Jan"	"Feb"	"Mar"	"Apr"	"May"	"Jun"	"Jul"	"Aug"	"Sep"	"Oct"	"Nov"	"Dec"
270040	1970	    	    	    	    	    	    	    	    	    	    	    	    
270040	1971	    	    	    	    	    	    	    	    	    	    	    	    
270040	1972	    	    	    	    	    	    	    	    	    	    	    	    
270040	1973	    	    	    	    	    	    	    	    	    	    	    	    
270040	1974	    	    	    	    	    	    	    	    	    	    	    	    
270040	1975	    	    	    	    	    	    	    	    	    	    	    	    
270040	1976	    	    	    	    	    	    	    	    	    	    	    	    
270040	1977	    	    	    	    	    	    	    	    	    	    	    	    
270040	1978	    	    	    	    	    	    	    	    	    	    	    	    
270040	1979	    	    	    	    	    	    	    	    	    	    	    	    
270040	1980	    	    	    	    	    	    	    	    	    	    	    	    
270040	1981	    	    	    	    	    	    	    	    	    	    	    	    
270040	1982	    	    	    	    	    	    	    	    	    	    	    	    
270040	1983	    	    	    	    	    	    	    	    	    	    	    	    
270040	1984	    	    	    	    	    	    	    	    	    	    	    	    
270040	1985	    	    	    	    	    	    	    	    	    	    	    	    
270040	1986	    	    	    	    	    	    	    	    	    	    	    	    
270040	1987	    	    	    	    	    	    	    	    	    	    	    	    
270040	1988	    	    	    	    	    	    	    	    	    	    	    	    
270040	1989	    	    	    	    	    	    	    	    	    	    	    	    
270040	1990	    	    	    	    	    	    	    	    	    	    	    	    
270040	1991	    	    	    	    	    	    	    	    	    	    	  104	  483
270040	1992	  127	  305	  114	  279	    	    	    	    	    	    5	   66	   51
270040	1993	  292	 1087	  917	  267	    	    	    	    	    	   25	   51