Cambodia is located in Southeast Asia, in the tropical zone, just 10-13 degrees north of the equator. Like most of Southeast Asia, Cambodia is warm to hot year round and the climate is dominated by the annual monsoon cycle with its alternating wet and dry seasons. The monsoon cycle is driven by cyclic air pressure changes over central Asia. As theMap Southeast Asia pressure drops during the summer months (June through October), moist air is drawn landward from the ocean bringing the southwest monsoon rains to Cambodia and much of Southeast Asia. Come the winter months (November through May), the air pressure over central Asia rises, driving cool dry air back across Southeast Asia and bringing on a largely rainless dry season to Cambodia. The mean daily temperature also rises and falls with the winter and summer months, but not exactly in time with the wet and dry season, effectively creating four annual seasons in Cambodia: