Lu'an has a monsoon-influenced, humid subtropical climate, with four distinct seasons. Winters are cold and damp, with average low temperatures in January dipping just below freezing; the January 24-hour average temperature is 2.6 °C (36.7 °F). Summers are typically hot and humid, with a July average of 27.8 °C (82.0 °F). The annual mean is 15.68 °C (60.2 °F), while annual precipitation averages just above 1,100 millimetres (43 in), a majority of which occurs from May to August. Annual sunshine duration is 2,000 to 2,300 hours.