page_title: Tianshui
section_title: Geography
hierarchical_section_title: Tianshui / Geography
caption_attribution_description: English: China AMS Topographic Maps
context_page_description: Tianshui is the second-largest city in Gansu Province, China. Its population is approximately 3.5 million. The city and its surroundings have played an important role in the early history of China, as still visible in the form of historic sites.
context_section_description: Tianshui is located in the valley of the Jie River, a major tributary of the Wei River. The city has a monsoon-influenced, cool semi-arid climate (Köppen BSk), with four distinct seasons of comparatively equal length. Winters are cold but dry, with January 24-hour average temperature of −1.5 °C (29.3 °F), while summers are warm and somewhat humid, with July 24-hour average temperature of 23.2 °C (73.8 °F). Much of the annual rainfall occurs from June to September, and the annual mean temperature is 11.44 °C (52.6 °F). With monthly percent possible sunshine ranging from 34% in September to 50% in December, the city receives 1,911 hours of bright sunshine annually.
caption: Map including Tianshui (labeled as T'IEN-SHUI (CH'IN-CHOU) (walled) 天水(秦州)) (AMS, 1955)
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