December in Tønsberg averages a daily high of 2°C with nights around -3.5°C. Expect roughly 15.3 wet days totalling 106.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Tønsberg is June–September.
Based on MELSOM, NO (5.4km), 1995–2024. 23 years of December data.