December in Royal Oak averages a daily high of 3.5°C with nights around -2.8°C. Expect roughly 11 wet days totalling 49.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Royal Oak is August–September.
Based on DETROIT CITY AIRPORT, MI US (14.4km), 1995–2024. 28 years of December data.