What are the warmest cities in the United States?

According to a list of the U.S. cities that have the most days over 90 degrees F, number one is Yuma, Arizona, which has 175 days a year above 90 degrees; second is Phoenix, with 167; and third is Tucson, with 140. Also on the list are Las Vegas, Nevada; Fort Myers, Florida; and the Texas cities of Brownsville, San Antonio, Austin, San Angelo, and Corpus Christi.