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Irfan Khan/Los Angeles Times/TNS

Yuma, Ariz., has more than one claim to fame. On top of being featured in the name of a classic Western, it also holds the title as the consistently hottest city in the U.S. Though it has an average daily high of 87, more than 116 days a year reach over 100 degrees, the most in the contiguous 48 states. It also has the least annual rainfall, receiving an average of just 3.3 inches. Despite this, farming is possible along the Colorado River thanks to strategic irrigation.