December in Pontiac averages a daily high of 3°C with nights around -3.6°C. Expect roughly 14.1 wet days totalling 60.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Pontiac is May–September.
Based on PONTIAC WWTP, MI US (2.9km), 1995–2024. 13 years of December data.