Climate & Geology

Climate

It is typical humid subtropical monsoon climate in Chengdu, in feature of the distinctive seasons whereas no extreme climate condition has been recorded. Days with fine air quality (API<100) account for 87.4% annually.

Annual Mean Temperature: 16.2℃.

Annual Mean Relative Humidity: 84%.

Average Annual Precipitation: 873-1265mm

Wind

Dominant wind directions: east, north and northeast

Annual mean wind speed: 1.2 m/s, annual mean static wind frequency: 46%

Geology, Topography and Soil Characteristics

Chengdu city is situated at the southeast of the Chengdu Plain, high in west and low in east, a typical inland area.

Tectonic units of Chengdu include Mt. Longquan thrust belt, Chengdu Depression and Longmenshan Fold. The soil is mostly brown silt clay.

Geological structure of Chengdu plain consists of hard Cambria pegmatite fundus, miscellaneous fill of average depth about 5 to 7 meters and sand-cobble layer of average depth about 7 to 10 meters. Since the looseness of miscellaneous fill, sand and cobble, there are dense small gaps within the structure, the structure can absorb the seismic wave travels greatly. Due to the unique geological structure, Chengdu plain has no devastating damage so far after experiencing strong ‘Wenchuan Earthquake’ on May 12, 2008 and its subsequent aftershocks.

River System and Hydrology

The water system originates from Dujiangyan Irrigation System diverted from the inner branch of Minjiang River.

The groundwater is abundant and of fine quality.