December in Tartu averages a daily high of -0.3°C with nights around -4.5°C. Expect roughly 19.1 wet days totalling 52.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Tartu is May–August.
Based on TARTU TORAVERE, EN (20.1km), 1995–2024. 30 years of December data.