Weather history and climate summary information is available for the following locations:
- Huron
- Rapid City
- Sioux Falls
- Watertown
Warmest December Days
The warmest December days in South Dakota are:
| Rapid City, South Dakota | 1939 | 74.3°F |
| Rapid City, South Dakota | 1965 | 73°F |
| Rapid City, South Dakota | 1941 | 71.2°F |
| Rapid City, South Dakota | 1957 | 70.9°F |
| Rapid City, South Dakota | 1969 | 70°F |
Coldest December Days
The coldest December days in South Dakota were:
| Watertown, South Dakota | 1983 | -30.1°F |
| Watertown, South Dakota | 1973 | -30.1°F |
| Huron, South Dakota | 1985 | -29.9°F |
| Huron, South Dakota | 1990 | -29.9°F |
| Watertown, South Dakota | 1989 | -29.2°F |
Wettest December Days
The wettest single days in December occurred:
| Huron, South Dakota | 2008 | 2 inches |
| Sioux Falls, South Dakota | 1983 | 1 inches |
| Watertown, South Dakota | 1992 | 1 inches |
| Huron, South Dakota | 1987 | 0.9 inches |
| Sioux Falls, South Dakota | 1984 | 0.9 inches |