December in Kingston averages a daily high of 0.3°C with nights around -6.8°C. Expect roughly 14.1 wet days totalling 81.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Kingston is May–September.
Based on HARTINGTON IHD, ON CA (27.8km), 1995–2024. 29 years of December data.