December in Lanzhou averages a daily high of 2.1°C with nights around -13.3°C. Rain is rare — about 1.7 wet days and 1.8mm across the month. A hard month to visit for comfort alone.
Across the year, the best time to visit Lanzhou is April–September.
Based on YU ZHONG, CH (35km), 1995–2024. 17 years of December data.