This variable is retrieved from the API as a fraction, please multiply by 100 to get percentages.
The TAHMO_VAR009 is the measurement data, please use this one.
Classify each measurement into a direction (N, NE, E, SE, S, SW, W, NW),
Direction North are values above 337.5 and below 22.5, North-east values between 22.5 and 67.5 etc….
The direction with most occurrences within the specified timeframe will be the representing value.