December in Omsk averages a daily high of -9.9°C with nights around -17.8°C. Expect roughly 14.9 wet days totalling 28.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Omsk is May–September.
Based on OMSK, RS (2.9km), 1995–2024. 24 years of December data.