The climate varies greatly depending on what part of the Inland Empire you're visiting. Summer temperatures in the mountains and in Temecula, 20 mi from the coast, usually hover around 80°F, though it's not uncommon for Riverside to reach temperatures over 100°F. In winter, temperatures in the mountains and in Temecula usually range from 30°F to 55°F, and in the Riverside area 40°F to 60°F. Most of the ski resorts open when the first natural snow falls (usually in November) and close in mid-March.