December in Granby averages a daily high of -0.6°C with nights around -7.9°C. Expect roughly 17.1 wet days totalling 103.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Granby is May–September.
Based on GRANBY, QC CA (2.2km), 1995–2024. 25 years of December data.