Source: The Library Of Congress Country Studies
Like the rest of tropical Africa, Angola experiences distinct, alternating rainy and dry seasons. In the north, the rainy season may last for as long as seven months--usually from September to April, with perhaps a brief slackening in January or February. In the south, the rainy season begins later, in November, and lasts until about February. The dry season (cacimbo) is often characterized by a heavy morning mist. In general, precipitation is higher in the north, but at any latitude it is greater in the interior than along the coast and increases with altitude.
Temperatures fall with distance from the equator and with altitude and tend to rise closer to the Atlantic Ocean. Thus at Soyo, at the mouth of the Congo River, the average annual temperature is about 26°C, but it is under 16°C at Huambo on the temperate central plateau. The coolest months are July and August (in the middle of the dry season), when frost may sometimes form at higher altitudes.
Data as of 1989