January in Biysk averages a daily high of -11.5°C with nights around -22.6°C. Expect roughly 13.3 wet days totalling 31.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Biysk is May–September.
Based on BIJSK ZONALNAJA, RS (23.2km), 1995–2024. 25 years of January data.