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The climate is tropical but relatively mild for the latitude. Climatic differences between various parts of the country are affected by the sun's journey north or south of the equator and the corresponding position of the intertropical convergence \one, the boundary between the moist southwesterly winds and the dry northeasterly winds. Except in the north, there are two rainy seasons, from April to June and from September to November. In the north squalls occur in March and April, followed by occasional rain until August and September, when the rainfall reaches its peak.
Temperatures range between 21°C and 32°C (70°F - 90°F), relative humidity between 50% and 80%. Rainfall ranges from 30 to 80 inches a year. The harmattan, a dry desert wind, blows from the northeast from December to March lowering the humidity and causing hot day and cool nights in the north. The effect of this wind is felt in the south during January. In most areas, temperatures are highest in March and lowest in August after the rains. Variation between day and night temperatures is relatively small, but greater in the north, especially in January, on account of the harmattan.
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