January in Nashua averages a daily high of 1.6°C with nights around -9.4°C. Expect roughly 9.7 wet days totalling 96.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Nashua is May–June.
Based on NASHUA 2 NNW, NH US (2.9km), 1995–2024. 28 years of January data.