December in Karlsruhe averages a daily high of 6.6°C with nights around 0.9°C. Expect roughly 16.6 wet days totalling 73.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Karlsruhe is May–September.
Based on RHEINSTETTEN, GM (6.7km), 1995–2024. 17 years of December data.