Weather history and climate summary information is available for the following locations:
- Cincinnati
- Cleveland
- Columbus
- Dayton
- Wilmington
- Youngstown
Warmest January Days
The warmest January days in Ohio are:
| Columbus, Ohio | 1950 | 73.9°F |
| Dayton, Ohio | 1950 | 72°F |
| Cincinnati, Ohio | 1999 | 72°F |
| Dayton, Ohio | 1943 | 70.3°F |
| Youngstown, Ohio | 1950 | 70°F |
Coldest January Days
The coldest January days in Ohio were:
| Dayton, Ohio | 1994 | -25.1°F |
| Dayton, Ohio | 1985 | -24.2°F |
| Youngstown, Ohio | 1994 | -22°F |
| Cincinnati, Ohio | 1994 | -22°F |
| Columbus, Ohio | 1994 | -22°F |
Wettest January Days
The wettest single days in January occurred:
| Dayton, Ohio | 1990 | 5.6 inches |
| Dayton, Ohio | 1973 | 5.5 inches |
| Cincinnati, Ohio | 2000 | 2.7 inches |
| Columbus, Ohio | 1973 | 2.7 inches |
| Columbus, Ohio | 2000 | 2.5 inches |