January in Belleville averages a daily high of -1.3°C with nights around -10.4°C. Expect roughly 12.5 wet days totalling 66.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Belleville is May–September.
Based on BELLEVILLE, ON CA (2.3km), 1995–2024. 26 years of January data.