Valid for hourly data files (/SIO/[year]/Hourly/SIO_[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. Solar Radiation (W/m^2)
10. Average Wind Speed (m/s)
11. Maximum Wind Speed (m/s)
12. Wind Direction (degrees)