The topography is higher in the northeast, lower in the southwest. North and northeast are mountainous area with waters, south is an alluvial plain - the Pearl River Delta. Guangzhou enjoys a subtropical monsoon climate. There is neither intense heat in summer nor severe cold in winter. It enjoys plenty rainfall and evergreen in four seasons. The average temperature is 22.8℃, the average relative humidity is about 68%, and the annual rainfall at the urban area is over 1,600 mm.
