December in Friedrichshafen averages a daily high of 4.4°C with nights around -0.4°C. Expect roughly 14.7 wet days totalling 70.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Friedrichshafen is June–September.
Based on FRIEDRICHSHAFEN UNTERRADERACH, GM (4km), 1995–2024. 22 years of December data.