WEBXichang (labelled as HSI-CH'ANG (NING-YÜAN) 西昌 (寧遠)) (1954) Climate. Owing to its low latitude and high elevation, Xichang has a monsoon-influenced humid subtropical climate (Köppen Cwa) milder and far sunnier than the Sichuan Basin, with mild, very sunny and dry winters, and very warm, rainy summers. The monthly 24-hour average ...