January in Harrisburg averages a daily high of 2.7°C with nights around -5.2°C. Expect roughly 10.1 wet days totalling 72mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Harrisburg is May–June.
Based on HARRISBURG 1 NE, PA US (1.5km), 1995–2024. 25 years of January data.