January in Greater Sudbury averages a daily high of -6.7°C with nights around -16.4°C. Expect roughly 16.5 wet days totalling 42.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Greater Sudbury is June–September.
Based on SUDBURY CLIMATE, ON CA (21.6km), 1995–2024. 13 years of January data.