December in Wilhelmshaven averages a daily high of 6.1°C with nights around 2.2°C. Expect roughly 18.6 wet days totalling 77.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Wilhelmshaven is May–September.
Based on WANGERLAND HOOKSIEL, GM (10.6km), 1995–2024. 25 years of December data.