December in Jiayuguan averages a daily high of 0°C with nights around -13.1°C. Rain is rare — about 2.1 wet days and 2.3mm across the month. A hard month to visit for comfort alone.
Across the year, the best time to visit Jiayuguan is April–June.
Based on JIUQUAN, CH (17.5km), 1995–2024. 25 years of December data.