Sincerely ask! What are the climate characteristics and temperature conditions in Sichuan Basin in summer?

Chengdu is located in the middle reaches of Minjiang River in the west of Sichuan Basin, with an altitude of 387-5364 meters, with Longquan Mountain in the east and Qionglai Mountain in the west. In the west, Longmen Mountain runs through the north and south. Plain area accounts for 36.4%, hilly area accounts for 30.4%, and mountainous area accounts for 33.2%. The plain area is high in northwest and low in southeast, with an average slope of 0.3%. It has a subtropical humid monsoon climate with four distinct seasons, no intense heat in summer and no severe cold in winter, and the annual average temperature is 16.7℃. The terrain of Sichuan basin is closed, and the temperature is higher than other areas at the same latitude. The average temperature in Leng Yue is 5 ~ 8℃, which is 2 ~ 4℃ higher than that in Shanghai, Wuhan in the same latitude and Guiyang in the south latitude. Extreme minimum temperature -6 ~-2℃. Frost and snow are scarce, and the frost-free period is 280 ~ 350 days throughout the year. Changning, located in the Yangtze River valley, is frost-free all year round.

Summer in Sichuan Basin begins at the end of May and lasts for more than 4-5 months. The temperature in the hottest month is as high as 25-29℃, the Yangtze River basin is nearly 30℃, and the extreme maximum temperature in the southeast of the basin often exceeds 40℃. Chongqing and Pengshui used to have 44℃, so Chongqing is also one of the three "stoves" in the Yangtze River Basin. The sunny, hot and high temperature weather in midsummer caused a severe summer drought in the southeast of the basin.

The annual average temperature is 16 ~ 18℃. The active accumulated temperature above 10℃ is 4500 ~ 6000℃ and lasts for 8 ~ 9 months, belonging to the middle subtropical zone. The Yangtze River basin in the southeast is over 6000℃, such as Qijiang River is over 6 100℃, which is equivalent to the tropical climate of South Asia south of Nanling in China. The temperature in the basin is high in the east and low in the west, high in the south and low in the north, high in the bottom and low in the edge, and the isotherm distribution is concentric. The temperature in the mountainous area on the edge of the basin has vertical distribution characteristics. The elevation of Emei Mountain and Jinfo Mountain rises by 100 m, and the temperature drops by 0.55℃ and 0.6 1℃ respectively. The average annual temperature at the top of Mount Emei is only 3℃, and the active accumulated temperature above 10℃ is 586℃, which is equivalent to cold temperate zone and sub-cold zone in climate.

The annual precipitation in Sichuan Basin is 65,438+0,000 ~ 65,438+0,300 mm, and the precipitation in the mountainous areas around the basin is very rich. For example, the annual precipitation in the western mountainous area between Leshan and Ya 'an is 1.500 ~ 1.800mm, which is a prominent rainy area in China and is called "West China Rain Curtain". However, winter drought, spring drought, summer waterlogging and autumn Mao Mao rain are unevenly distributed in the year, and 70 ~ 75% of the rainfall is concentrated in 6 ~ 10. The maximum daily precipitation can reach 300 ~ 500mm. "Night rain" has been famous since ancient times, and it accounts for more than 60 ~ 70% of the total rainfall. The fog in the basin is big and wet, and the clouds are low and cloudy. Emei Mountain and Jinfo Mountain are the foggy areas in China, and the annual relative humidity is also the highest in China. The annual sunshine in the basin is only 900 ~ 1300 hours, and the annual solar radiation is 370 ~ 420 KJ/cm2, both of which are the lowest in the country, so it is called "the tree spring barks at the sun". Light hours 107 1 hour, with an average annual rainfall of 945.6 mm Chengdu is located in the east of Chengdu Plain, with an average elevation of about 500 meters. Chengdu Plain is the largest plain in southwest China. Dujiangyan Water Conservancy Project, located on the main stream of Minjiang River, has a fan-shaped irrigation canal network distributed on the vast Chengdu Plain, making Chengdu Plain a "land of plenty" where "floods and droughts follow people and hunger is not enough". See: /view/2585.htm for details? fr=ala0_ 1_ 1