December in Rosenheim averages a daily high of 4.4°C with nights around -2.3°C. Expect roughly 14.5 wet days totalling 63.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Rosenheim is May–September.
Based on ROSENHEIM, GM (2.2km), 1995–2024. 29 years of December data.