The geographical environment of Jiashan County
The outline of Jiashan's territory is in the shape of a field, with the terrain higher in the south and lower in the north, with an average height of 3.67 meters (Wusong elevation).
The east-west flowing rivers in the county include Taihe Jingang, Dazhai River, Weishui Port, Hehui Port, Xietang, and the north-south Lucuxutang and other rivers flowing through the town. The main flood discharge channel. There are many lakes in the northern part of the county, with a water area of more than 750 acres: Fenhu Lake, Changbai Lake, Xiamu Lake, Xiangfu Lake, Jiangjiayang, Masie Lake, Beixu Yang, Agarwood Lake, Baiyudang, Xihu Lake, Six hundred acres of land.
Fen 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 of it belongs to Zhejiang and half to Jiangsu. Fen Lake was called Fen Lake in ancient times, with a total area of 9,700 acres.
The Taipu River is an important river in the Taihu Basin and a large river in the southwest of Shanghai. It is named because it connects Taihu Lake and the Huangpu River. Jiashan County is located in the East Asian monsoon area at the southern edge of the North Subtropical Zone. It has four distinct seasons, is mild and humid, has sufficient sunlight, abundant rainfall, and a long frost-free period, making it suitable for crop growth. It is located in the coastal mid-latitude zone, with obvious climate changes, including spring wetness, summer heat, It is characterized by dry autumn and cold winter. The main disastrous weather includes heavy rain, continuous rain, drought, cold wave, heavy snow, heavy fog, high temperature and typhoon.
The average temperature over the years is 15.8℃. January is the coldest, with an extreme minimum temperature of -10.8℃, which occurred on January 31, 1977; July is the hottest month, with an extreme maximum temperature of 40.7℃, which occurred in August 2013. July 7th. The average frost-free period is 233.6 days, and the annual average number of freezing days is 39 days.
The average rainfall over the years is 1155.7 mm, with the highest rainfall of 1683.4 mm occurring in 1999 and the lowest rainfall of 695.1 mm occurring in 1978. The average annual rainfall is 138.5 days, and the maximum daily precipitation is 167.6 mm, which occurred on August 22, 1977. The average number of snowfall days over the years is 7.8, with the highest number of snowfall days in January, reaching 3.5 days. The maximum snow depth was 22 cm, which occurred on February 2, 2008.
The average sunshine hours over the years are 1927.3 hours, of which January to February are the least, with an average of less than 125 hours; July to August are the most, with an average of more than 210 hours.
The average wind speed over the years is 3.1 meters/second, and there are an average of 5.4 days of strong winds with instantaneous wind speed ≥17 meters/second per year. The maximum wind speed in the past years was 35.5 meters/second (above level 12), which occurred on March 6, 1987.