December in Flint averages a daily high of 2.4°C with nights around -4.8°C. Expect roughly 14.2 wet days totalling 48.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Flint is May–September.
Based on FLINT FCWOS, MI US (7.2km), 1995–2024. 30 years of December data.