Average Precipitation for South Dakota in May
The tables below give monthly averages for rainfall plus snowfall during May at cities, towns and parks in South Dakota.
Each place has a total for the amount of precipitation it usually receives this month. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.
The precipitation totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.
You can jump to a separate table for each region of the state: Eastern, Central and Western South Dakota.
Eastern South Dakota
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 10 | Aberdeen | 3.3 | 83 |
| 13 | Brookings | 3.5 | 88 |
| 11 | Huron | 3.2 | 80 |
| 12 | Mitchell | 3.7 | 94 |
| 12 | Sioux Falls | 3.9 | 98 |
| 10 | Vermillion | 4.0 | 101 |
| 11 | Watertown | 2.9 | 73 |
| 10 | Waubay Wildlife Refuge | 2.9 | 74 |
| 12 | Yankton | 3.7 | 93 |
Central South Dakota
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 11 | Academy | 3.5 | 90 |
| 10 | Mobridge | 3.1 | 78 |
| 11 | Pickstown | 4.0 | 102 |
| 11 | Pierre | 3.3 | 83 |
Western South Dakota
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 14 | Custer | 3.5 | 90 |
| 11 | Hot Springs | 3.3 | 83 |
| 10 | Interior | 3.6 | 92 |
| 14 | Lead | 4.9 | 124 |
| 9 | Lemmon | 2.8 | 72 |
| 14 | Mt. Rushmore National Memorial | 4.8 | 122 |
| 13 | Pactola Reservoir Dam | 4.3 | 108 |
| 10 | Porcupine | 3.2 | 81 |
| 13 | Rapid City | 3.5 | 88 |
| 12 | Spearfish | 3.7 | 94 |
| 11 | Wind Cave National Park | 3.7 | 95 |
Reference
NOAA National Centers for Environmental Information (NCEI). Climate Normals.