December in Voronezh averages a daily high of -1.8°C with nights around -6.4°C. Expect roughly 14.3 wet days totalling 51.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Voronezh is May–September.
Based on VORONEZ, RS (3.9km), 1995–2024. 24 years of December data.