December in Troisdorf averages a daily high of 6.5°C with nights around 1.1°C. Expect roughly 17.1 wet days totalling 65.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Troisdorf is May–September.
Based on KOLN BONN, GM (6.3km), 1995–2024. 30 years of December data.