December in Saint Petersburg averages a daily high of -0.8°C with nights around -4.9°C. Expect roughly 18.3 wet days totalling 53.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Saint Petersburg is May–August.
Based on ST. PETERSBURG, RS (3.2km), 1995–2024. 24 years of December data.