"station_id"	"year"	"Jan"	"Feb"	"Mar"	"Apr"	"May"	"Jun"	"Jul"	"Aug"	"Sep"	"Oct"	"Nov"	"Dec"
01040500	1993	     	     	     	     	     	     	     	     	     	  0.40	  0.40	  0.43
01040500	1994	  0.44	  0.41	  0.39	  0.42	  0.49	  0.49	  0.48	  0.45	  0.42