December in Konstanz averages a daily high of 4.6°C with nights around -0.1°C. Expect roughly 14.1 wet days totalling 62mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Konstanz is May–September.
Based on KONSTANZ, GM (2.3km), 1995–2024. 30 years of December data.