Equatorial Guinea has a tropical climate with distinct wet and dry seasons. From June to August, Río Muni is dry and Bioko wet; from December to February, the reverse occurs. In between there is gradual transition. Rain or mist occurs daily on Annobón, where a cloudless day has never been registered. The temperature at Malabo, Bioko, ranges from  to , though on the southern Moka Plateau normal high temperatures are only . In Río Muni, the average temperature is about . Annual rainfall varies from  at Malabo to  at Ureka, Bioko, but Río Muni is somewhat drier.