January in Passaic averages a daily high of 4.5°C with nights around -3.7°C. Expect roughly 10.9 wet days totalling 86.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Passaic is May–June.
Based on TETERBORO AIRPORT, NJ US (6.1km), 1995–2024. 30 years of January data.