An attempt has been made to correlate the total solar radiation for Yola and Calabar with available meteorological data on sunshine duration, maximum air temperature and relative humidity using some of the model equations recently proposed. Yearly and seasonal (wet and dry seasons) variations have been considered. For Calabar, excellent fits (standard error of estimate, Se 0.005, adjusted coefficient of determination, R 2 a 0.994, maximum percentage error, MPE 2%) are achieved using 3- or 4-parameter model equations for both yearly and seasonal variations. For Yola, an 8-parameter model equation is necessary to obtain a good yearly fit (Se = 0.008, R 2 a = 0.989, MPE = 2%), while 4-parameter model equations for the two seasons give satisfactory fits (MPE 2.5%). However, using smaller time intervals (of 3 or 4 months), much better fits (MPE < 1%) can be obtained using only 2- or 3-parameter model equations as appropriate.