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Table 8 Error (%) between the measured and estimated values of extraterrestrial solar radiation (H 0) of the six cities

From: Evaluation of global solar radiation from meteorological data in the Sahelian zone of Chad

Month Abeche N’Djamena Ati Bokoro Mongo Moussoro
January 3.543 4.214 4.491 3.853 4.144 3.839
February −6.746 −5.517 −5.873 −5.847 −5.58 −6.466
March −13.475 −11.366 −12.683 −11.673 −11.426 −13.228
April −17.038 −15 −16.286 −15.295 −15.057 −16.8
May −17.557 −14.743 −16.802 −15.038 −13.981 −17.321
June −17.038 −14.183 −16.286 −14.481 −14.24 −16.8
July −16.771 −13.923 −16.01 −14.221 −13.981 −16.533
August −16.771 −13.923 −16.01 −14.221 −13.981 −16.533
September −14.598 −12.5 −13.824 −12.804 −12.559 −14.353
October −8.011 −6.555 −7.168 −6.879 −6.618 −7.747
November 0.939 1.884 1.854 1.53 1.815 1.228
December 7.227 7.855 8.209 7.482 7.783 7.534
Average −9.691 −7.813 −8.866 −8.133 −7.807 −9.432