Hourly averages of RH

[signehl]

As far as I can see the resampling to hourly averages is the same for all variables, except for wind direction. Have I missed somewhere where RH is treated differently or are RH values also simple hourly averages? I am asking because I think for the average to make physical sense they need to be converted to specific humidity (and perhaps then back to RH?), but I am not sure?