Under the Köppen climate classification, Cayenne has an equatorial climate (''Af'') bordering on a tropical monsoon climate (''Am''). Average high and low temperatures are nearly identical throughout the course of the year averaging about  and  respectively, although temperatures are somewhat cooler in the wet season unlike the dry season. Cayenne sees copious precipitation during the year, more subject to the Intertropical Convergence Zone (ITCZ) than the trade winds. The city features a very lengthy wet season and a very short dry season. The dry season covers only two months of the year (September and October) while the wet season covers the remainder of the year. Precipitation is seen even during the dry season, a trait commonly seen in places featuring tropical climates. Cayenne averages roughly  of rain each year.