The Koppen climate classification system is a widely used vegetation-based empirical climate classification system. The classification system is based on a subdivision of terrestrial climates into five major types. It was developed by German botanist-climatologist Wladimir Koppen.
The five major types of terrestrial climates of the Koppen climate classification system are represented by the capital letters A, B, C, D and E. All of the climate types except B are defined by temperature criteria. The B climate type is designated for climates where the controlling factor in vegetation is dryness rather than coldness. In 1990, Wladimir Koppen published the first climate classification scheme. He continued to publish revisions until his death in 1940.