Scottsdale is one of many cities located in what is called the Valley of the Sun where there are more than 330 days of sunshine per year. The long summer from May through September is divided into the dry summer and the wet summer. The dry summer sees very high temperatures, low humidity, and no precipitation. The wet summer or the monsoon season lasts from July through mid-September with short late-day thunderstorms and high winds. In the fall the precipitation ends and temperatures start to drop. Winter is cooler with occasional frost warnings but no snow. The best time to visit Scottsdale is in the spring when temperatures are pleasant for outdoor activities.