December in Frechen 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 Frechen is May–September.
Based on KOLN STAMMHEIM, GM (14.4km), 1995–2024. 28 years of December data.