Congo lies within four terrestrial ecoregions: Atlantic Equatorial coastal forests, Northwestern Congolian lowland forests, Western Congolian swamp forests, and Western Congolian forest–savanna mosaic. Since the country is located on the Equator, the climate is consistent year-round, with the average day temperature a humid  and nights generally between  and . The average yearly rainfall ranges from  in the Niari Valley in the south to over  in central parts of the country. The dry season is from June to August, while in the majority of the country, the wet season has two rainfall maxima: one in March–May and another in September–November.