Here are 7 facts about monsoon season.PHOENIX – When people think of the Desert Southwest, their first thoughts may not gravitate to rainfall, but during three months of the year, images of thunderstorms and flooding are actually common.While the start and end dates of each year’s activity can vary, the monsoon season generally runs from June 15 through September 30.During this stretch of the summer, a ridge of high pressure becomes established and winds turn more southerly, allowing moisture from the Pacific, Gulf...