January in Lancaster averages a daily high of 4.2°C with nights around -5°C. Expect roughly 10.5 wet days totalling 77.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Lancaster is May–June.
Based on LANCASTER 2 NE FILT PLANT, PA US (3km), 1995–2024. 30 years of January data.