Arizona has mild winters and hot summers, with thunderstorms during the summer months between July and September. Great extremes in temperatures occur between day and night throughout the state, particularly in the desert areas where daytime temperatures over 125°F (52°C) have been recorded. During winter temperatures average 70°F (21°C), dropping to below freezing in the desert valleys, and summer temperatures can vary from 80°F (27°C) to 35-40°F (2-4°C) at night. Snow falls on the mountains, but not in the desert areas, and the mild temperatures in the southern desert attract many tourists in winter.