December in Petrozavodsk averages a daily high of -3.5°C with nights around -8.5°C. Expect roughly 19.8 wet days totalling 45.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Petrozavodsk is June–August.
Based on PETROZAWODSK, RS (5.5km), 1995–2024. 23 years of December data.