January in Trenton averages a daily high of 4.4°C with nights around -4.2°C. Expect roughly 10.7 wet days totalling 84.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Trenton is May–June.
Based on TRENTON MERCER AIRPORT, NJ US (9.1km), 1995–2024. 26 years of January data.