Abstract
A statistical comparison of 7 sunshine-based models, designed to
evaluate the monthly average daily global radiation on horizontal
surfaces, has been performed for 77 European stations. A general
conclusion is that the Glover and McCulloch model, the Gopinathan
model, and the Page model perform the worst. Taking into account
published reports, this was not expected for Pageâs and Gopinathanâs
models. If results for the MBE and the RMSE obtained using data for
all stations together are used to establish a ranking of the models,
Rietveldâs monthly specific model and Doniaux and Lemoineâs monthly
independent model perform the best. The last-mentioned model is latitude
dependent, and valid for stations between 4âN and 61âN. The results
obtained are encouraging relating its use for latitudes/geographical
regions different from those used in this work. In any case it should
not be neglected in possible future statistical comparisons, as it
has been up to now.
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