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What is the yearly average amount of rainfall in a desert biome?

Answer:
In the USA, the "Hot and Dry" desert biomes experiences less than 10 inches per year. However, I've spoken with more than a few desert museum-type docents, and several believe that less than four inches per year qualifies an area to be considered a desert.
There are three other types of desert to be found in the world. Their stats may vary. For more information, please see the related ink below.
First answer by LeastDuck. Last edit by LeastDuck. Contributor trust: 691 [recommend contributor recommended]. Question popularity: 0 [recommend question].