December in Deventer averages a daily high of 6.2°C with nights around 1.2°C. Expect roughly 16.1 wet days totalling 70.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Deventer is May–September.
Based on HEINO, NL (20.9km), 1995–2024. 30 years of December data.