December in Trois-Rivières averages a daily high of -1.8°C with nights around -8.4°C. Expect roughly 14.1 wet days totalling 88.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Trois-Rivières is June–September.
Based on TROIS RIVIERES, QC CA (2.4km), 1995–2024. 27 years of December data.