December in Smolensk averages a daily high of -2.3°C with nights around -6.7°C. Expect roughly 19.5 wet days totalling 52mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Smolensk is May–September.
Based on SMOLENSK, RS (3.3km), 1995–2024. 24 years of December data.