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Ji'an (Chinese: 吉安) is a prefecture-level city in Jiangxi province, People's Republic of China, bordering Hunan to the west. It has an area of 25,219 km2 (9,737 sq mi) and as of the 2010 census, had a population of 4,810,339, of whom 538,699 live in the built-up (or metro) area made of 2 urban districts. The local speech is a variety of Gan Chinese.The former deputy governor of the People's Bank of China, Xiao Gang, is from here. This city is also the home of Jinggangshan University.It was formerly known as Luling (庐陵).Ji'an has a humid subtropical climate affected by the East Asian monsoon, with long, humid, very hot summers and cool and drier winters with occasional cold snaps. The monthly 24-hour average temperature ranges from 6.5 °C (43.7 °F) in January to 29.5 °C (85.1 °F) in July, with an annual average of 18.40 °C (65.1 °F). The average annual precipitation is 1,520 mm (60 in). With monthly percent possible sunshine ranging from 19% in March to 59% in July, the city receives 1,641 hours of bright sunshine annually. Winter begins somewhat sunny and dry but becomes progressively wetter and cloudier; spring begins especially gloomy, and from April to June each of the months averages more than 210 mm (8.3 in) of rainfall. After the heavy rains subside in June, summer is especially sunny. Autumn is warm and relatively dry.Jinggangshan Airport in Taihe County serves Ji'an.Jinggangshan University is located in Qingyuan District, Ji'an.The Ji'an Public Library serves the city.本回答被网友采纳