“In Harlington, Texas, rows on rows of trailers, each with its palm tree, house some of the thousands of 'Winter Texans' who flock to the lower Rio Grande Valley to escape the northern cold. Average temperature of 75˚F (25˚C), humidity of 60 percent, and rainfall of 25 inches (64 centimeters) mean an almost ideal climate for tourism.“

(Text adapted from and photograph shot on assignment for the National Geographic book The Great Southwest, 1980)