Seasonality is not accounted for in a classical approach to the Quality of the relationship. However, seasonality can be accounted for in empirical estimations of the Quality of the relationship. The 1% per 10 meter rule of thumb is just that. It needs to be evaluated on a case by case basis. Insufficient vertical separation between anemometers used for calculating shear leads to higher shear extrapolation uncertainty. The NCEP Reanalysis Surface Winds map indicates that only a few regions might have an annual variability greater than 6% Analysis conducted on 231 ground stations shows that much of the US has an IAV closer to 4% and only a very small portion of the US is >=6%.
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