Congo Basin in April

December through February offers the driest conditions and clearest forest paths. June through August provides another dry window, though temperatures climb higher. Avoid March through May when heavy rains make roads impassable and wildlife viewing difficult. The forest stays humid year-round at 80-90%, but dry months reduce mosquito populations and improve your chances of spotting animals at water sources. Gorilla permits in Odzala cost $400 and require booking months ahead through tour operators. Plan for 7-10 days minimum to account for travel time between locations and weather delays that can ground small aircraft.