Weather history and climate summary information is available for the following locations:
- Cincinnati
- Cleveland
- Columbus
- Dayton
- Wilmington
- Youngstown
Warmest December Days
The warmest December days in Ohio are:
| Cleveland, Ohio | 1982 | 77°F |
| Youngstown, Ohio | 1982 | 75.9°F |
| Columbus, Ohio | 1982 | 75.9°F |
| Columbus, Ohio | 1982 | 75.9°F |
| Cincinnati, Ohio | 1982 | 75°F |
Coldest December Days
The coldest December days in Ohio were:
| Dayton, Ohio | 1989 | -20°F |
| Columbus, Ohio | 1989 | -17°F |
| Columbus, Ohio | 1989 | -16.8°F |
| Dayton, Ohio | 1989 | -16.8°F |
| Dayton, Ohio | 1983 | -15.2°F |
Wettest December Days
The wettest single days in December occurred:
| Dayton, Ohio | 1990 | 2.7 inches |
| Cleveland, Ohio | 1990 | 2.6 inches |
| Columbus, Ohio | 1998 | 2.6 inches |
| Cleveland, Ohio | 1992 | 2.4 inches |
| Dayton, Ohio | 2011 | 2.4 inches |