The climate is subtropical in the summer, temperate the rest of the year, with occasional fog and rare frosts. Temperatures range from 35°F in winter to 95°F in summer, with brief periods above 100°F in August and early September. The driest months are May and July. Annual rainfall averages 19-22 inches, but fluctuates to less than 10 inches. The rains are heaviest from November to January and ease off slightly in February and March. Summer is hot and humid, with almost cloudless skies. The "scirocco," a warm humid southeast wind, occurs in spring and from mid-September to mid-October. The "gregale," a cold wind from the east and northeast in the winter, occasionally reaches gale forces of 70 miles per hour. Winter is chilly and damp with occasional heavy downpours, but also with many fine sunny days.