A comprehensive comparative analysis of the measured performance of a large scale integral type natural-circulation solar-energy crop dryer suitable for use in the tropics is presented for the two prevalent tropical wet and dry seasons. Generally, the performance of the dryer studied was dependent largely on the variations in insolation, ambient temperature and relative humidity. The drying conditions during the dry season were fairly constant (yielding a comparatively better performance), while the wet season drying conditions were more unpredictable and resulted in poorer drying.