Valid for hourly data files (/GPO/[year]/Hourly/GPO_[year][month][day].txt)
Columns headers are:
1. Year
2. Month
3. Day
4. Hour
5. Pressure (hPa)
6. Temperature (C)
7. Relative Humidity (%)
8. Precipitation (inches)
9. Average Wind Speed (m/s)
10. Maximum Wind Speed (m/s)
11. Wind Direction (degrees)
12. Solar Radiation (W/m^2)
13. NOT USED (MISSING)
14. NOT USED (MISSING)
15. NOT USED (MISSING)
16. NOT USED (MISSING)
17. NOT USED (MISSING)
18. NOT USED (MISSING)
19. NOT USED (MISSING)
20. NOT USED (MISSING)
21. NOT USED (MISSING)
22. NOT USED (MISSING)
23. NOT USED (MISSING)
24. NOT USED (MISSING)