code_name,Visibility
units,WMO code 4300
0 LESS THAN 50 METERS
1,50 - 200 METERS
2,200 - 500 METERS
3,500 - 1000 METERS
4,1 - 2 KM
5,2 - 4 KM
6,4 - 10 KM
7,10 - 20 KM
8,20 - 50 KM
9,50 KM OR MORE