Sully County, South Dakota: hazard risk
FEMA rates Sully County's overall risk Very Low (score 6.3 of 100, higher than 6% of rated U.S. counties). Its storm record holds 525 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 |
|---|---|---|---|
| Wildfire | Relatively Low | 70.6 | $270K |
| Cold Wave | Relatively Low | 51.1 | $1.5M |
| Winter Weather | Relatively Low | 50.1 | $96K |
| Drought | Relatively Low | 44.9 | $150K |
| Hail | Relatively Low | 34.7 | $217K |
| Ice Storm | Very Low | 24.2 | $34K |
| Tornado | Very Low | 14.6 | $201K |
| Riverine Flooding | Very Low | 14.1 | $2.6M |
| Strong Wind | Very Low | 8.9 | $97K |
| Heat Wave | Very Low | 7.5 | $17K |
| Landslide | Very Low | 7.0 | $21 |
| Earthquake | Very Low | 6.8 | $10K |
| Lightning | Very Low | 2.0 | $10K |
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 | 146 | 0 | – | 53rd of 66 | 1824th of 3,080 |
| Severe thunderstorm wind | 98 | 0 | – | 62nd of 66 | 2465th of 3,080 |
| Winter storms | 94 | 0 | $28K | 45th of 66 | 1599th of 3,077 |
| High wind and dust storms | 72 | 0 | – | 31st of 66 | 575th of 3,080 |
| Drought | 35 | 0 | – | 34th of 66 | 1243rd of 3,063 |
| Extreme cold | 32 | 0 | – | 39th of 66 | 794th of 3,076 |
| Tornadoes | 21 | 0 | $412K | 41st of 66 | 2111th of 3,080 |
| Floods | 14 | 0 | $9.2M | 56th of 66 | 2572nd of 3,080 |
| Heat | 9 | 0 | – | 39th of 66 | 1541st of 3,076 |
| Wildfires | 1 | 0 | – | 31st of 66 | 1152nd of 2,972 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Sully County record: every hazard by year and month, the deadliest events and FEMA's declarations.