Jiangxi has a humid subtropical climate (Cfa under the Köppen climate classification), with short, cool, damp winters, and very hot, humid summers. Average temperatures are about 3 to 9 °C (37 to 48 °F) in January and 27 to 30 °C (81 to 86 °F) in July. Annual precipitation is 1,200 to 1,900 millimetres (47 to 75 in), much of it falling in the heavy rains occurring in late spring and summer.
Nanchang, the provincial capital and the most densely populated city, is one of the largest Chinese metropolises. Nanchang is the hub of Jiangxi civilization throughout its history, which plays a leading role in the commercial, intellectual and industrial and political fields.[6] While Ganzhou is the largest subdivision of Jiangxi.