The Savanna biome has a wet/dry climate. Its Köppen climate group is Aw. The A stands for a tropical climate and the w for a dry season in the winter.
Savanna climatic condition has the following characteristics:
- In the savanna climate there is a distinct dry season, which is in the winter. Savannas get all their rain in the summer months. During the distinct dry season of a savanna, most of the plants shrivel up and die. Some rivers and streams dry up. Most of the animals migrate to find food.
- In the wet season all of the plants are lush and the rivers flow freely. The animals migrate back to graze. In West Africa the rainy season begins in May.
- It is usually cooler during the dry season by a few degrees. Because it is in the tropical latitudes that is still hot enough. The savanna climate has a temperature range of 20° – 30° C. In the winter, it is usually about 20° – 25° C. In the summer the temperature ranges from 25° – 30° C. In a Savanna the temperature does not change a lot. When it does, it is very gradual and not drastic.
- There is an annual precipitation of 10 to 30 inches (100 to 150 cm) of rain. From December to February hardly any rain falls at all.