Geographical environment of Xiangtan county

Xiangtan County is located in the east of central Hunan Province, on the west bank of the lower reaches of Xiangjiang River, at the northern foot of Hengshan Mountain, in the northern section of Heng Chang hilly basin, between 27 20 ′-28 05 ′ north latitude and1/2 25 ′-13 03 ′ east longitude. Xiangtan county belongs to subtropical monsoon humid climate, with long winter and summer seasons, short spring and autumn seasons, long summer hot period, short cold period, abundant heat, concentrated rain, small spatial distribution difference of light, temperature and water, and more disastrous weather, which has obvious continental climate characteristics. Annual average temperature 16.7- 18.3℃, 1 monthly average temperature is about 5℃, July average temperature is about 30℃, extreme maximum temperature is 4 1.2℃, and extreme minimum temperature is-12./kloc-. The average annual precipitation day is 150 days, and the average annual precipitation is1300mm. The annual average sunshine hours 1584- 1885 hours, and the frost-free period is 273 days.

The average annual temperature in Xiangtan county is generally between 16.7~ 18.3℃. 65438+ 10 is the coldest month, and the average monthly temperature is generally around 5℃. 199 1 year extreme low temperature is-12. 1℃. It is the hottest in July, with an average monthly temperature of about 30℃, an extreme high temperature of 465,438 0.2℃ and a temperature difference of 24~25℃ between winter and summer. The annual minimum temperature is generally between -2℃ and -8℃, and the annual maximum temperature is generally between 39℃ and 40℃. The average annual precipitation days in the county are about 150 days, with 190 days in the most years and 125 days in the least years. The annual average precipitation is about 1300mm, which is about 5% less than the average precipitation in the whole province. Among them, 1750.2 mm has the largest annual precipitation, and the youngest precipitation is only 997.7 mm

The average total sunshine hours in Xiangtan county are 1584~ 1885 hours. The sunshine is the most in July and the least in February. There is a great difference between years, with the maximum sunshine year reaching 265,438+027.7 hours and the minimum sunshine year reaching 65,438+0449.5 hours. There are many southeasterly winds in spring and summer, southerly winds in midsummer and northerly winds in autumn and winter. The wind speed is greater than 17m/s, and the instantaneous wind speed reaches more than 8, which occurs every year, with an average of 7-8 times a year, and the maximum wind speed is 20m/s. ..