Weather history and climate summary information is available for the following locations:
- Huron
- Rapid City
- Sioux Falls
- Watertown
Warmest January Days
The warmest January days in South Dakota are:
| Rapid City, South Dakota | 2005 | 73.4°F |
| Rapid City, South Dakota | 2012 | 71.1°F |
| Rapid City, South Dakota | 1989 | 70°F |
| Rapid City, South Dakota | 1987 | 70°F |
| Rapid City, South Dakota | 1990 | 69.1°F |
Coldest January Days
The coldest January days in South Dakota were:
| Huron, South Dakota | 1988 | -36.9°F |
| Watertown, South Dakota | 2009 | -34.1°F |
| Watertown, South Dakota | 1974 | -33.2°F |
| Watertown, South Dakota | 1985 | -32.3°F |
| Sioux Falls, South Dakota | 1974 | -31°F |
Wettest January Days
The wettest single days in January occurred:
| Huron, South Dakota | 1973 | 3.2 inches |
| Rapid City, South Dakota | 1999 | 2.2 inches |
| Sioux Falls, South Dakota | 1973 | 2.2 inches |
| Rapid City, South Dakota | 1995 | 1.4 inches |
| Watertown, South Dakota | 1980 | 1 inches |