December in Hamilton averages a daily high of 6.7°C with nights around -3.3°C. Expect roughly 12.7 wet days totalling 87.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Hamilton is September–October.
Based on HAMILTON BUTLER CO REGIONAL AIRPORT, OH US (5.5km), 1995–2024. 27 years of December data.