Average annual temperatures for South Dakota (8°C/46°F) are slightly below the average for United States (13°C/55°F).
Average annual rainfall for South Dakota (498mm/20 inches) is significantly below the average for United States (1,039mm/41 inches).
July is the hottest or warmest month in South Dakota, with an average maximum temperate of 30°C/86°F.
February is the coolest or coldest month in South Dakota, with an average minimum temperate of -13°C/9°F.
May is the wettest or most rainy month in South Dakota, with an average rainfall of 74mm/3 inches.
January is the driest or least rainy month in South Dakota, with an average rainfall of 12mm/0 inches.
Sioux Falls is the hottest or warmest place in South Dakota, with an average maximum temperate of 9°C/48°F.
Rapid City is the coldest place in South Dakota, with an average maximum temperate of 6°C/43°F.
Sioux Falls is the most rainy or wettest place in South Dakota, with an average annual rainfall of 781mm/31 inches.
Sioux Falls is the least rainy or driest place in South Dakota, with an average annual rainfall of 781mm/31 inches.
| Place | Min Temp | Max Temp | Avg Temp | Rainfall |
|---|---|---|---|---|
| Rapid City | -2 | 14 | 6 | - |
| Sioux Falls | 3 | 15 | 9 | 781 |