Vienna has a temperate continental climate, with warm, sunny summers, and bitterly cold winters. The average temperature in winter (December to February) ranges between 23°F and 34°F (-5°C to 2°C), while in summer (June to August), temperatures fluctuate between 75°F and 91°F (24°C and 33°C). Thunderstorms occur frequently in summer and snowfall is common in winter. Spring, autumn and the beginning of summer are perhaps the best times to enjoy the city, except for avid skiers and snowboarders who take to Austria's exceptional slopes during the winter months.