December in Amherst averages a daily high of 3.2°C with nights around -3.2°C. Expect roughly 18 wet days totalling 97.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Amherst is May–September.
Based on BUFFALO NIAGARA INTERNATIONAL AIRPOR, NY US (6.1km), 1995–2024. 30 years of December data.