Muscat features a hot, arid climate (Köppen climate classification ''BWh'') with long and very hot summers and warm "winters".  Annual rainfall in Muscat is about 10 cm (4 in), falling mostly from December to April. In general, precipitation is scarce in Muscat, with several months on average seeing only a trace of rainfall. However, in recent years, heavy precipitation events from tropical systems originating in the Arabian Sea have affected the city. Cyclone Gonu in June 2007 and Cyclone Phet in June 2010 affected the city with damaging winds and rainfall amounts exceeding 100 mm (4 in) in just a single day. The climate generally is very hot and also very humid in the summer, with temperatures frequently reaching as high as 40 °C (104 °F) in the summer.