Sunwu County (simplified Chinese: 孙吴县; traditional Chinese: 孫吳縣; pinyin: Sūnwú Xiàn) is a county under the administration of Heihe City in the north of Heilongjiang province, China, situated on the bank of Amur River, which demarcates the Sino-Russian border. The length of border line within Sunwu county is 36 km (22 mi).
Sunwu County has a monsoon-influenced humid continental climate (KöppenDwb) with very warm, humid summers and severely cold, extremely dry winters. The monthly 24-hour average temperature ranges from −23.3 °C (−9.9 °F) in January to 20.4 °C (68.7 °F), while the annual mean is +0.18 °C (32.3 °F). More than three-fourths of the annual precipitation occurs from June to September. With monthly percent possible sunshine ranging from 52% in July to 73% in February, the area receives 2,576 hours of bright sunshine annually.
Climate data for Sunwu (1991–2020 normals, extremes 1971–2010)