December in Barrie averages a daily high of 0.4°C with nights around -5.9°C. Expect roughly 17.7 wet days totalling 93.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Barrie is May–September.
Based on SHANTY BAY, ON CA (2.6km), 1995–2024. 28 years of December data.