Tunisia consists of two climatic belts, with Mediterranean influences in the north and Saharan in the south. Temperatures are moderate along the coast, with an average annual reading of 18° C (64° F ), and hot in the interior south. The summer season in the north, from May through September, is hot and dry; the winter, which extends from October to April, is mild and characterized by frequent rains. Temperatures at Tunis range from an average minimum of 6° C (43° F ) and maximum of 14° C (57° F ) in January, to an average minimum of 21° C (70° F ) and maximum of 33° C (91° F ) in August. Precipitation in the northern region reaches a high of 150 cm (59 in) annually, while rainfall in the extreme south averages less than 20 cm (8 in) a year.