Geographical environment of Tonglu county

Tonglu County is located in the northwest of Zhejiang Province, in the middle reaches of Qiantang River, between 29 35' ~ 30 05' north latitude and11910' ~19 58' east longitude. Zhuji in the east, Pujiang and Jiande in the south, Chun 'an in the west, Fuyang in the northeast and Lin 'an in the northwest. The whole territory is about 77 kilometers long from east to west and 55 kilometers wide from north to south. Total area 1825 square kilometers. Taking the county town as the center, it is 20km (diameter distance, the same below) east to Fuyang at Niufengling boundary, 3km south to Jiande 19 at the top of Yang Jiao, 39km west to Chun 'an at Taiyangshan boundary and 3km north to Fuyang 13 at Chenjiashan boundary; It is 27km away from the Pujiang River at the top of Huoshao Bay in the southeast, 2km away from Jiande/KLOC-0 in Dayan Moutain in the southwest, 6km away from Fuyang/KLOC-0 in Hengshan Port in the northeast and 4km away from Lin 'an in Gaotang in the northwest. Tonglu has a subtropical monsoon climate with four distinct seasons, abundant sunshine and abundant precipitation. Light, temperature and water basically increase or decrease synchronously throughout the year, with good coordination and rich climate resources. The annual average temperature is 65438 06.5℃; The extreme maximum temperature is 4 1.7℃, and the extreme maximum temperature is ≥35℃ for an average of 29 days. Freezing weather with extreme minimum temperature of -9.5℃ and extreme minimum temperature of ≤0℃, with an annual average of 3 1 day. The average annual rainfall days are 16 1 day. The average annual precipitation is 1.552 mm, which varies greatly during the year. It increases month by month from 1 to June and decreases month by month from July to August. From March to September, the rainfall was above 1.30mm, and in June, the rainfall was the most concentrated, with an average monthly rainfall of 248 mm and an annual average relative temperature of 79%, with little interannual change between 76%-8 1%. The frost-free period is 258 days. Catastrophic weather occurs every year in Tonglu, and the serious impacts are: flood, drought, wind, thunder, hail, snow and freezing.