December in Groningen averages a daily high of 6°C with nights around 0.9°C. Expect roughly 17.1 wet days totalling 78.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Groningen is May–September.
Based on EELDE, NL (10.7km), 1995–2024. 30 years of December data.