December in Gatineau averages a daily high of -1.7°C with nights around -9.6°C. Expect roughly 15.7 wet days totalling 90mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Gatineau is May–September.
Based on CHELSEA, QC CA (7.7km), 1995–2024. 21 years of December data.