Gran Canaria is noted for its rich variety of micro climates. Generally speaking though, the average daytime high ranges from 20°C in winter, to 26°C in summer. Some cool nights occur in winter, but lows below 10°C are unknown near the coast. Inland the climate is still mild but mountainous areas see the occasional frost or snow. Annual rainfall averages 228 mm, most of this falling in the cooler months, with July, August and September normally rainless. Rainfall is unevenly distributed through the island with some areas being much drier than others. Cloud cover and sunshine is often quite variable during the cooler months, and there can be several rather cloudy days at times in winter. Summers are generally quite sunny however, with the south of the island being most favoured.