The Kimberley has a tropical monsoon climate. The region receives about 90% of its rainfall during the short wet season, from November to April, when cyclones are common (especially around Broome) and the rivers flood. The annual rainfall is highest in the northwest, where Kalumburu and the Mitchell Plateau average per year, and lowest in the southeast where it is around . In the dry season, from May to October, south easterly breezes bring sunny days and cool nights. Climate change since 1967 has led to large increases of as much as per year in annual rainfall over the whole region. A recent study suggests Asian pollution, may be a key contributory factor to this increased rainfall. In 1997 and 2000, the region received especially heavy rains, leading to record flooding of the Fitzroy and other rivers.