Tianshui has a monsoon-influenced, four-season, cool semi-arid climate (Köppen BSk), with seasons of comparatively equal length. Winters are cold but dry, with an average January temperature of −2 °C (28.4 °F), while summers are warm and somewhat humid, with an average July temperature of 22.8 °C (73.0 °F). Much of the annual rainfall occurs from June to September, and the annual mean temperature is 11.0 °C (51.8 °F)
