Djibouti has an arid climate (Köppen: ''BWh''). It is characterised by very hot rainless summers and a very warm, slightly wetter winter season. Most of the annual precipitation falls between October and May. The city sees on average  of rainfall per year. Average high temperatures range from  during the months of December, January and February, to about  in July. There are two seasons: a hot dry season from May to October and a cooler season with more precipitation from November to April (winter). The rainfall on the coast usually occurs between November to March, whereas further inland it falls between April to October. In the summer months, temperatures routinely exceed , with relative humidity at its lowest point of the year. Sunshine is abundant in the city, averaging eight to ten hours a day year-round. It is lowest during the rainy period, when there is some coastal fog and greater cloud coverage as warm air passes over the cool sea surface. However, precipitation is highly variable and long periods without any rainfall occur throughout the year. Unusual episodes of heavy rain sometimes occur, with a maximal  falling in November 1949.