January in Plainfield averages a daily high of 4.7°C with nights around -5.3°C. Expect roughly 9.1 wet days totalling 92.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Plainfield is May–June.
Based on CANOE BROOK, NJ US (13km), 1995–2024. 30 years of January data.