December in Cincinnati averages a daily high of 7.3°C with nights around -2.2°C. Expect roughly 11.6 wet days totalling 88.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Cincinnati is September–October.
Based on CINCINNATI MUNICIPAL AIRPORT LUNKEN FIELD, OH US (8.8km), 1995–2024. 30 years of December data.