The average annual temperature in Alabama is 64°F (18°C), with the northern counties experiencing cooler temperatures and the southern counties having relatively warmer temperatures, influenced by the Gulf of Mexico. The average summer temperature is 79°F (26° C) and the average winter temperature is 48°F (9°C). The best time to visit Alabama would be in summer or autumn, outside of the tornado season and when visitors can witness the fiery colours of the autumn leaves. Snow occasionally falls in the northern regions and frosts are periodic.