At first I thought it was an error to call an area that gets plenty of rain a desert. I thought desert was strictly defined by the amount of rainfall. But maybe that's not correct. The wikipedia article on desert states...
"Deserts can be classified by the amount of precipitation that falls, by the temperature that prevails, by the causes of desertification or by their geographical location." [1]
I wonder if there's a stricter definition used in a specific scientific context.