December in Darmstadt averages a daily high of 5.4°C with nights around 0°C. Expect roughly 15.8 wet days totalling 63.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Darmstadt is May–September.
Based on DARMSTADT, GM (2.2km), 1995–2024. 30 years of December data.