As an archipelago, the climatic conditions in the province are affected by wind. Most of the province has wet tropical climate, there is rainy season and dry season interspersed with transition season with the lowest average temperature 20.4 °C. In November to February monsoon winds comes from the north and between June to December the monsoon winds comes from the south. During the northern monsoon the wind velocity at sea could range from 20–30 knots, on land the wind can range from 3–15 knots. This causes potentially extreme weather in the Riau Islands with rainfall of about 150–200 millimeters and wave height between 1.2 meters up to 3 meters.