Just a month before the official start to summer, some mountain residents awoke Monday morning to a wintry scene, and snow and rain showers are predicted for much of the week. But just how rare is this late-in-the-season dusting? “We weren’t shocked,” said Brenda Norton, co-owner of the Broadway Cafe, 1117 W. Big Bear Blvd., on Monday morning. “We always get snow usually around Mother’s Day, so this is pretty normal.”According to the National Weather Service, the Big Bear area saw a dusting of snow in early May last year May 2, to be exact. About an inch and a half fell at that time.