Because the mouth of the Yangtze River moved northward during the Ming dynasty, Haimen has dealt with flooding that destroyed parts of the county, including Lüsi (吕四; 呂四), Yudong (余东; 余東), and Sijia (Chinese: 四甲).[7]
In 1672, under the Kangxi Emperor of the Qing dynasty, the seat moved to Jinghai Township (静海乡; 靜海鄉). Starting from 1701, the river's course moved south, creating more than 40 new sandbanks. In 1768, the county became an independent subprefecture with the seat moving to Maojia Town (茅家镇; 茅家鎮).[7]
In 1912, one year after the Republic of China was founded, Haimen once again became a county. However, in 1949, when the People's Republic of China was founded, Haimen became governed under Nantong Prefecture. Once county-level governments started to reappear in 1983, Haimen was reinstated as a county, and in June 1994, Haimen became a county-level city.[7]
According to the Köppen climate classification system, Haimen has a humid subtropical climate (Cwa). This means that Haimen experiences four distinct seasons; the summers are hot and the winters are cold. The summers are rainier than the other seasons, and the summer rains usually bring flooding.[10]
The average temperature is 15.2 °C (59.4 °F) in Haimen. January is the coldest month, and July is the hottest month. The hottest temperature recorded in Haimen was 39.7 °C (103.5 °F), occurring on August 8 2013. The coldest temperature ever recorded was −9.4 °C (15.1 °F) on January 8, 2021.[10][11]
The average yearly rainfall is 1,056.3 millimetres (41.59 in). The wettest year was 1975 with 1,500.7 millimetres (59.08 in), and the driest year was 1978 with 654.6 millimetres (25.77 in).[10]
Climate data for Haimen (1991–2020 normals, extremes 1981–present)
- It is only township and its area is 9 km2 (3.5 sq mi). It is pene-enclave on Chongming Island, most of which belongs to Shanghai.
Transport
With easy access to the Sea and Yangtze River, transportation is very convenient. Less than 2 hours driving distance to Shanghai Pudong International Airport, about 40 mins driving distance to Nantong Xingdong Airport and Nantong Railway Station, which has high speed bullet train. There are multiple entries to the national Highway system, e.g. G40 Expressway.
Close to Port of Nantong, Haimen is currently developing its own county level sea port in DongZaoGang town. There is an easy access to Sutong Yangtze River Bridge to cross the Yangtze, as well as ferry service.
^Haimen Municipal People's Government. 陆一飞 (in Chinese). Archived from the original on 2016-03-03. Retrieved 2010-07-30.
^Haimen Municipal People's Government (2010-03-10). 市政府关于市长副市长市长助理分工的通知 (in Chinese). Haimen. Archived from the original on 2016-03-03. Retrieved 2010-07-30.
^Haimen Municipal People's Government. "Boundary & Area". Archived from the original on 2015-01-12. Retrieved 2010-07-30.