December in Terrebonne averages a daily high of -0.9°C with nights around -8.5°C. Expect roughly 10.9 wet days totalling 76.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Terrebonne is May–September.
Based on RIVIERE DES PRAIRIES, QC CA (11.4km), 1995–2024. 24 years of December data.