The Köppen climate classification system was first published in 1918 by German climatologist Wladimir Köppen. Faced with a lack of adequate observing stations, Köppen used vegetation to approximate ...

You probably saw a multi-colored climate map at least once in school. You might have pored over it, fascinated. Was Antarctica really a cold desert? And why was so much of Russia listed as tundra?

It's no secret that Phoenix is hot, but late summer and the start of fall were scorchers, even by Valley of the Sun standards. Between Sept. 23 and Oct. 14, Phoenix set daily record high temperatures ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. The Koppen classification system suggests ...