Geographical environment of Jiashan county

Jiashan territory is field-like, with high terrain in the south and low terrain in the north, with an average elevation of 3.67 meters (Wusong elevation).

There are Taihe Jinggang, Dazhai River, Xushui Port, Hehui Port and Xietang in the east-west direction in the county, and Luxu Pond flows through the town in the north-south direction, which is the main flood discharge channel for the west-east water flow. There are many lakes in the north of the county seat, with the water area of more than 750 mu: Hu Fen, Changbai, Natsume, Xiangfudang, Jiangjiayang, Chiyansong Lake, Beixuyang, Aquilaria sinensis, Baiyudang, Xihu Dang and Liumudang.

Hufen Lake is located at the junction of Jiashan, Zhejiang and Wujiang, Jiangsu. It is 6 kilometers long from east to west and 3 kilometers long from north to south. Half goes to Zhejiang and half to Jiangsu. Fen Lake was called Fen Lake in ancient times, with a total area of 9700 mu.

Taipu River is an important river in Taihu Lake basin and a big river in the southwest of Shanghai. It is named after connecting Taihu Lake and Huangpu River. Jiashan County is located in the East Asian monsoon region on the southern edge of the northern subtropical zone, with four distinct seasons, mild and humid, abundant sunshine, abundant rainfall and long frost-free period, which is suitable for crop growth. Located in the mid-latitude coastal zone, the climate changes obviously, with the characteristics of wet in spring, hot in summer, dry in autumn and cold in winter. The main disastrous weather includes rainstorm, continuous rain, drought, cold wave, heavy snow, fog, high temperature and typhoon.

The annual average temperature 15.8℃, 65438+ 10 is the coldest, and the extreme minimum temperature-10.8℃ appears in1977+0+31; It was the hottest in July, and the extreme maximum temperature was 40.7℃, which occurred in 2065438+August 7, 2003. The average frost-free period is 233.6 days, and the average annual freezing days are 39 days.

The annual average rainfall 1 155.7mm and the annual maximum rainfall 1683.4mm appear in 1999. The minimum rainfall is 695. 1mm, which occurs at 1978. The annual average rainy day is 138.5 days, and the maximum daily precipitation is 167.6 mm, which occurred on1August 22, 977. The average number of days of snowfall over the years is 7.8 days, and the most is 65438+ 10, which is 3.5 days. The maximum snow depth was 22 cm, which appeared on February 2, 2008.

The average sunshine hours over the years are 1927.3 hours, of which1~ February is the least, and the average is below 125 hours. July and August are the most, with an average of more than 2 10 hour.

The average annual wind speed is 3. 1 m/s, and the average number of windy days with instantaneous wind speed ≥ 17 m/s is 5.4 days. The maximum wind speed over the years was 35.5 m/s (above12), which occurred on March 6, 1987.