Abstract
Using existing and new empirical model equations to analyse available data for nine stations located in different geographical and climatic zones in Nigeria, it is clearly demonstrated that maximum air temperature is an important climatological parameter which should be used in solar radiation modelling in Nigeria. It is also shown that seasonal variations in the values of the model parameters are significant. Preliminary investigations are also reported which show that (1) a slight modification of the Swartman-Ogunlade formulae improves their applicability to Nigerian stations, and (2) maximum air temperature and relative humidity can be used together (to the exclusion of sunshine duration) to predict solar radiation with satisfactory accuracy.
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