December in Saint-Jérôme averages a daily high of -1.8°C with nights around -9.6°C. Expect roughly 11.6 wet days totalling 80.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Saint-Jérôme is June–September.
Based on ST JEROME, QC CA (4.2km), 1995–2024. 20 years of December data.