Cameroon climate can be divided into two groups: a dry season and a rainy (wet) season.
Given the topography and geographically location of Cameroon, the climate varies vastly just within a few travel distance.
For instance, Douala and Buea are less than one hour apart but their Climates are completely different.
Generally one can divide Cameroon into a northern and southern region for Climate description purposes - this division is for discussion purposes and a generalization but conditions you experience on the ground are bound to be different.
Rainy season: May to September
Generally little to no rainfall.
Drought is common place.
Dry season: October to April
Average temperature 32C
Sharp drops in temperature are experienced during the night especially on the Adamawa Plateau region.
Can get very humid.
Dry season: November to February
Rainy season: March to June and August to September (major rain fall)
Average temperature: 79F (26C)
Average rainfall 100cm to 1000cm depending on the region, generally highest in the western coastal mountainous slopes and decreasing northwards.