The geographical environment of Hai 'an County

Hai 'an belongs to the humid climate zone of the northern subtropical marine monsoon. The climate is mild, with four distinct seasons, pleasant climate and moderate heat and cold. Sufficient sunshine, abundant rain and long frost-free period. The weather is changeable in spring, hot and rainy in summer, cool in autumn and cold and dry in winter. The annual average temperature in Hai 'an 14.5℃. 65438+ 10 is the coldest month with an average of 1.7℃. It is the hottest in July and August, with an average of 27℃. The highest year is July 1964, and the temperature reaches 29.6℃. 1953 The highest temperature was 39.5℃ on August 24th, and the extreme high temperature reached 39.7℃ in July 2003, a record high.

The average annual precipitation in Hai 'an is 1025 mm, and 79% of the years are above 800 mm ... The year with the highest precipitation is 199 1, reaching1636.9mm.. The summer precipitation is the most, accounting for 47% of the whole year, and the winter precipitation is the least, accounting for 9%. The longest continuous precipitation days are 13 days, and the precipitation is 279.5mm, ranging from 1 969 July 6 to 18 days, and the longest continuous non-precipitation days are 48 days, ranging from1980/kloc-0 to February 3, 980.

hydrology

The rivers in Hai 'an County belong to the Yangtze River and Huaihe River. Toarey Yang Canal belongs to the Yangtze River system in the south and the Huaihe River system in the north. There are 7 first-class rivers: Bencha Canal, Jiao Gang, Beiling River, Xintongyang Canal, Tongyu Canal, Ruhai Canal (water diversion project) and Toarey Yang Canal. The Toarey Yang Canal was dug in the Han Dynasty. In order to obtain the benefits of salt, Wu Wang Liu Bi dug Shangguan River and Yunyan River (namely Toarey Yang Canal), which are the oldest rivers in the county. Secondary rivers 13: Chuanchang River, Dingbao River, Xingu River, Hongxing River, Jianghuang River, Tanhe River, Yangang River and Jianghai River. There are 56 third-class rivers and 465 fourth-class rivers. The east-west backbone rivers are: New and Old Toarey Yang Canal, Bencha Canal and Beiling River; North-South backbone rivers: Chuanchang Canal, Tongyu Canal, Dingbao River, Ruhai Canal, Jiao Gang and Quya River; There are Dongtang River, Beiyang River, Wanqi River and Xitang River in He Lixia.