on the north by Hangzhou Bay, across which it faces Jiaxing and Shanghai; on the west by Shaoxing; and on the south by Taizhou. Its land area is , while its oceanic territory amounts to ; there is a total of coastline, including of mainland coastline and of island coastline that together accounting for one-third of the entire provincial coastline. There are 531 islands accounting for under the city's administration. Ningbo's city proper is sandwiched between the ocean and low-lying mountains to the southwest, with coastal plain and valleys in between. Important peninsulas include the Chuanshan Peninsula (), located in Beilun District and containing mainland Zhejiang's easternmost point, and the Xiangshan Peninsula () in Xiangshan County. The Siming Mountains () run north from Mount Tiantai and within Ningbo City, traversing Yuyao City, Haishu District, and Fenghua District, and reaching a height of . Tidal flat ecosystems occur adjacent to the city, however, a large areas have been reclaimed for agricultural purposes. Climate Ningbo has a humid subtropical climate (Köppen Cfa) with four distinctive seasons, characterized by hot, humid summers and chilly, cloudy and dry winters (with occasional snow). The mean annual temperature is , with monthly daily averages ranging from in January to in July. Extremes since 1951 have ranged from on 12 January 1955 to on 8 August 2013. The city receives an average annual rainfall of and is affected by the plum rains of the Asian monsoon in June, when average relative humidity also peaks. From August to October, Ningbo experiences the effects of typhoons, and is affected by an average 1.8 storms annually, though the city is not often struck directly by these systems. A 2012 OECD study lists Ningbo among the top 20 cities worldwide most at risk of flooding due to anthropogenic climate change. Administrative structure and divisions Local officers of Ningbo The Secretary of Party in Ningbo is Peng Jiaxue, who is first-in-charge of the city. The Mayor of Ningbo is Qiu Dongyao, who is second-in command of the city, and the Vice Secretary of Party in Ningbo. Administrative divisions of Ningbo The sub-provincial city of Ningbo is as whole an urban group with one central group, one northern group, and one southern group. It has direct jurisdiction over the following: Six districts (central group): Haishu District, Yinzhou District, Jiangbei District, Beilun District, Zhenhai District, Fenghua District Two county-level cities (northern group): Yuyao, Cixi