January in Waterbury averages a daily high of 3°C with nights around -7°C. Expect roughly 10 wet days totalling 72.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Waterbury is August–October.
Based on MERIDEN MARKHAM MUNICIPAL AIRPORT, CT US (19.4km), 1995–2024. 25 years of January data.