December in Fredrikstad averages a daily high of 2.8°C with nights around -3°C. Expect roughly 15.3 wet days totalling 102mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Fredrikstad is June–August.
Based on RADE TOMB, NO (12.7km), 1995–2024. 12 years of December data.