December in Bergisch Gladbach averages a daily high of 7°C with nights around 2.6°C. Expect roughly 16.9 wet days totalling 70.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Bergisch Gladbach is May–September.
Based on KOLN STAMMHEIM, GM (10.8km), 1995–2024. 28 years of December data.