Corson County, South Dakota: hazard risk
FEMA rates Corson County's overall risk Very Low (score 38.1 of 100, higher than 38% of rated U.S. counties); 1 of its 13 hazards are rated Relatively High or Very High, led by cold wave. Its storm record holds 939 events since 1950.
FEMA's rating for each hazard
These are FEMA's county-wide model ratings and this county's storm record. They are not an assessment of any property, address or building, and not insurance advice: a property's risk depends on its own elevation, construction and location.
FEMA gives each hazard its own rating, and a rating does not follow the score from one hazard to the next: a hazard with a higher score can carry a lower rating than another. The table sorts by FEMA's rating, then by score (0 to 100, the county against every other county for that hazard).
| Hazard | Risk rating | Score | Expected annual loss |
|---|---|---|---|
| Cold Wave | Relatively High | 91.8 | $4.9M |
| Winter Weather | Relatively Moderate | 77.1 | $108K |
| Wildfire | Relatively Low | 77.3 | $188K |
| Hail | Relatively Low | 64.8 | $268K |
| Ice Storm | Relatively Low | 37.4 | $28K |
| Strong Wind | Relatively Low | 35.7 | $213K |
| Drought | Very Low | 28.5 | $12K |
| Tornado | Very Low | 23.6 | $194K |
| Landslide | Very Low | 21.6 | $82 |
| Heat Wave | Very Low | 17.8 | $30K |
| Riverine Flooding | Very Low | 16.1 | $1.1M |
| Lightning | Very Low | 14.8 | $30K |
| Earthquake | Very Low | 7.4 | $4K |
Source: FEMA National Risk Index, December 2025 release. A model of future loss, not a count of past events. FEMA's National Risk Index map.
What the record holds
| Hazard | Records | Deaths | Damage | Rank in state | Rank in U.S. |
|---|---|---|---|---|---|
| Hail | 311 | 0 | $199K | 62nd of 66 | 2262nd of 3,080 |
| Severe thunderstorm wind | 238 | 0 | $209K | 65th of 66 | 2546th of 3,080 |
| High wind and dust storms | 112 | 0 | – | 58th of 66 | 1013th of 3,080 |
| Winter storms | 90 | 2 | $226K | 66th of 66 | 2442nd of 3,077 |
| Floods | 55 | 0 | $1.8M | 44th of 66 | 2342nd of 3,080 |
| Drought | 54 | 0 | – | 43rd of 66 | 1577th of 3,063 |
| Extreme cold | 37 | 0 | – | 50th of 66 | 1405th of 3,076 |
| Tornadoes | 23 | 0 | $2.8M | 63rd of 66 | 2553rd of 3,080 |
| Heat | 8 | 0 | $14K | 50th of 66 | 2066th of 3,076 |
| Wildfires | 5 | 0 | – | 8th of 66 | 884th of 2,972 |
| Lightning | 1 | 0 | – | 42nd of 66 | 2373rd of 3,080 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Corson County record: every hazard by year and month, the deadliest events and FEMA's declarations.