What's the climate like in Chengdu Plain?

Chengdu Plain has four distinct seasons, less sunshine, mild climate and abundant rainfall, and belongs to a warm and humid subtropical Pacific southeast monsoon climate zone. In the piedmont area of Longmen Mountain in the northwest of the plain, the temperature is low, the precipitation is abundant, the evaporation is slightly low, the rainfall in the east and southeast is slightly less, and the temperature is slightly higher. The temperature in Chengdu Plain has not changed much. The annual average temperature is 16. 1℃, and the annual maximum temperature generally appears in July and August. According to the data for many years, the monthly average maximum temperature does not exceed 26℃, and the monthly average minimum temperature is generally not lower than 4℃. So freezing is extremely rare, there is no freezing of soil and groundwater.

Abundant rainfall is one of the climatic characteristics of Chengdu Plain. Longmen Mountain is located on the west side of the plain, which has a significant impact on atmospheric rainfall. The water vapor coming from the east is blocked by the Longmen Mountain barrier, which forms topographic precipitation, resulting in a rainy belt in Ya 'an-Dujiangyan-Anxian, with an annual average rainfall of 1.200- 1.600 mm, and the rainfall decreases to the southeast. Rainfall in Wenjiang, Danxian, Xinfan and Guanghan areas 1 0,000. Rainfall is unevenly distributed in seasons. From June to September, a large amount of precipitation was generated under the control of warm and humid air masses in tropical oceans. The total rainfall in four months was 753.7 mm, accounting for 76% of the total precipitation in the whole year. Winter is controlled by dry and cold air mass in Chinese mainland, with dry climate and scarce precipitation. The average annual relative humidity in Chengdu Plain is 82. 1%, the average annual evaporation is 994 mm, the highest is115/mm, and the lowest is 960 mm ... The precipitation in summer and autumn greatly exceeds the evaporation, and the precipitation in winter and spring is less than the evaporation. Geographically, there is an increasing trend from the western mountainous area to the foot of Longquan Mountain.

brief introduction

Chengdu Plain, also known as West Sichuan Plain and West Basin Plain, is called "western sichuan bazi" in Sichuan dialect. It is an alluvial plain located in the west of Sichuan Basin in China, including all districts and counties in Chengdu, Guanghan and Jingyang District in Deyang, and is located between east longitude103 ~10442 ′ and north latitude 29 ′. It is 1 10 km long from north to south and 80 km wide from east to west, covering an area of about 9,000 square kilometers. It is the largest plain in the three southwestern provinces of China.