January in Ŭndŏk averages a daily high of -4.3°C with nights around -12.7°C. Rain is rare — about 2.5 wet days and 11.5mm across the month. A hard month to visit for comfort alone.
Across the year, the best time to visit Ŭndŏk is September.
Based on POSET, RS (40.8km), 1995–2024. 30 years of January data.