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No, Vista, California, is not in the desert. It has a Mediterranean climate type.
Vista is a city in North San Diego county, California.
The address of the Vista Botanical Gardens is: 200 Civic Center Dr, Vista, CA 92084-6275
The web address of the Rio Vista Museum is: http://www.museumsusa.org
The address of the Vista Ranchos Historical Society is: Po Box 1032, Vista, CA 92085-1032