December in Kiel averages a daily high of 5.1°C with nights around 1.1°C. Expect roughly 16.5 wet days totalling 68.3mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Kiel is June–September.
Based on KIEL HOLTENAU, GM (6.1km), 1995–2024. 23 years of December data.