Weather history and climate summary information is available for the following locations:
- Huron
- Rapid City
- Sioux Falls
- Watertown
Warmest April Days
The warmest April days in South Dakota are:
| Huron, South Dakota | 1980 | 97°F |
| Huron, South Dakota | 1992 | 95°F |
| Watertown, South Dakota | 1980 | 95°F |
| Sioux Falls, South Dakota | 1980 | 93.2°F |
| Huron, South Dakota | 1990 | 91.9°F |
Coldest April Days
The coldest April days in South Dakota were:
| Huron, South Dakota | 1975 | -2°F |
| Watertown, South Dakota | 1975 | 0.1°F |
| Watertown, South Dakota | 1997 | 3.2°F |
| Sioux Falls, South Dakota | 1975 | 3.9°F |
| Watertown, South Dakota | 1954 | 5°F |
Wettest April Days
The wettest single days in April occurred:
| Watertown, South Dakota | 1995 | 5.4 inches |
| Huron, South Dakota | 1973 | 4.7 inches |
| Rapid City, South Dakota | 2007 | 4.2 inches |
| Sioux Falls, South Dakota | 1989 | 4 inches |
| Sioux Falls, South Dakota | 2001 | 3.8 inches |