Geographical environment of Linli County

Linli County is located in the northwest of Hunan, in the middle and lower reaches of Lishui River, surrounded by mountains in the east, west and south, Tianjin in the east, Dingcheng and Taoyuan in the south, Shimen in the west and Lixian in the north. Its geographical coordinates are11124' ~1165448. It is 57.5 kilometers long from north to south and 32.5 kilometers wide from east to west, with a total area of 120343.2 hectares, accounting for 0.57% of the total area of the province. Linli is a humid monsoon climate with a transition from the middle subtropical zone to the north subtropical zone. Mild climate, sufficient heat, long frost-free period and weak freezing; Sufficient sunshine, frequent cold waves in spring and active cold dew wind in autumn; Rain is abundant, but unevenly distributed. It is concentrated in late spring and early summer, with heavy rainfall and drought in summer and autumn. Four distinct seasons and strong seasonality.

There are barriers in the northwest of the county, such as Kemu Mountain and Taiqing Mountain in Lixian County, which prevent the cold air in the north from sinking over the mountains and south, resulting in "wind-burning" effect, reducing humidity and raising temperature; In the middle is a "horseshoe shape" composed of Tongshan and Gu Shan from northeast to southwest; In the south, there are "Cuojikou" formed by Gushan, Tai Fu Shan, Taiyangshan (Dingcheng District), Qigushan and Ruan Shan. There is a "narrow mountain pass" formed by Shuicheng Cliff and Tai Fu Shan in the west. Cold air is easy to invade, accumulate and strengthen from Miansiwa, Zhanggongmiao and Sheshiqiao windward, forming a unique local climate in the county, which is high in the north and low in the south.

The temperature is high in the north and low in the south. The average temperature of the county over the years (refers to the average value of 1959- 1985, the same below): north17.1-17.3℃, middle 16.4℃, south/kloc. The extreme minimum temperature is-13℃ in the north and-15.7℃ in the south-central part.

The second is Changde Cryogenic Center. The annual average temperature of the whole county is 16.4℃, which is 0. 1-0.4℃ lower than that of surrounding counties, cities and districts. The ten-day average temperature over the years is 0. 1-0.4℃ higher than that of neighboring counties, cities and districts from early August to mid-September, and it is lower in other months. The extreme maximum temperature is 2.2℃ lower than that of Lixian County in the north and 2.5℃ lower than that of Dingcheng District in the south.

It's windy for more than three days. Strong winds of magnitude 8 or above have occurred over the years, with an average of 0.8 days per month, which is 0.2 days more than that of neighboring Lixian County and Taoyuan County and 0.7 days more than that of Cili County.

The relative rate of four-year average precipitation is small, and the rainy season ends late. The average relative rate of annual precipitation is13-14%; 4-13% smaller than Taoyuan; And the regional difference is small, and the annual precipitation is relatively stable; The average end date of the rainy season is July 5, and the latest is July 27.