December in Toronto averages a daily high of 2.9°C with nights around -2.6°C. Expect roughly 13.6 wet days totalling 66.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Toronto is June–September.
Based on TORONTO CITY, ON CA (4.4km), 1995–2024. 22 years of December data.