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Climate

Hangzhou's climate is humid subtropical (Köppen Cfa) with four distinct seasons, characterised by long, very hot, humid summers and chilly, cloudy and drier winters, albeit with occasional snow. The mean annual temperature is 17.0 °C (62.6 °F), with monthly daily averages ranging from 5 °C (41.0 °F) in January to 29.3 °C (84.7 °F) in July. The city receives an average annual rainfall of 1,438 mm (56.6 in) and is affected by the plum rains of the Asian monsoon in June. In late summer (August to September), Hangzhou suffers typhoon storms, but typhoons seldom strike it directly. Generally they make landfall along the southern coast of Zhejiang, and affect the area with strong winds and stormy rains. Extremes since 1951 have ranged from −9.6 °C (15 °F) on 6 February 1969 up to 41.9 °C (107 °F) on 3 August 2024; unofficial readings have reached −10.5 °C (13 °F), set on 29 December 1912 and 24 January 1916, up to 42.1 °C (108 °F), set on 10 August 1930. With monthly percent possible sunshine ranging from 30% in March to 51% in August, the city receives 1,709.4 hours of sunshine annually.