Feel free to use it. Climates also have names, I could have used them instead of letters but the names do not add much clarification. And climates indicates a combination of temperature and precipitation not the vegetation itself. For example: Dwa and Dfa have pretty much the same vegetation despite their differences/ some desert are completely dry while others have some life... Also, other factors than climate can influence the sort of vegetation found is some areas. A dry climate receiving a lot of rain from uphill might be able to sustain a forest.

You are working on something particular?