In Koppen's classification of climates, Cs, refers to

In Koppen's classification of climates, "Cs" refers to the "Mediterranean" climate. This climate is characterized by mild, wet winters and hot, dry summers. It is typically found in coastal regions with prevailing westerly winds, such as the Mediterranean Basin, California, and parts of South Africa and Australia. The mild temperatures and ample rainfall in the winter support a diverse range of vegetation, while the dry summers prevent forests from becoming too dense.