Throughout Iceland, the average difference between seasonal
mean wind speed calculated from the Weibull fit and that calculated
directly is 0.08 m s1 (0.04 m s1) in winter (summer) for
station data, and 0.10 m s1 (0.02 m s1) in winter (summer) for
WRF model data. Overall, there is therefore a small positive bias of
the Weibull fits compared with measurements, and a small negative
bias compared with model data. Mean absolute differences are
0.10 m s1 (0.05 m s1) in winter (summer) for station data, and
0.15 m s1 (0.05 m s1) in winter (summer) for WRF model data.
This amounts to 1e2% of the directly calculated averages.