Lyman County, South Dakota: hazard risk
FEMA rates Lyman County's overall risk Very Low (score 26.5 of 100, higher than 26% of rated U.S. counties). Its storm record holds 927 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 Moderate | 79.6 | $2.4M |
| Winter Weather | Relatively Moderate | 69.5 | $86K |
| Wildfire | Relatively Low | 69.5 | $115K |
| Hail | Relatively Low | 69.4 | $367K |
| Drought | Relatively Low | 55.4 | $144K |
| Ice Storm | Relatively Low | 37.8 | $32K |
| Tornado | Relatively Low | 27.6 | $297K |
| Riverine Flooding | Very Low | 29.1 | $2.3M |
| Heat Wave | Very Low | 22.7 | $53K |
| Landslide | Very Low | 22.1 | $98 |
| Strong Wind | Very Low | 16.0 | $91K |
| Earthquake | Very Low | 13.6 | $9K |
| Lightning | Very Low | 10.5 | $24K |
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. |
|---|---|---|---|---|---|
| Severe thunderstorm wind | 301 | 0 | $100K | 36th of 66 | 2262nd of 3,080 |
| Hail | 237 | 0 | – | 57th of 66 | 2003rd of 3,080 |
| High wind and dust storms | 113 | 0 | – | 40th of 66 | 683rd of 3,080 |
| Winter storms | 100 | 2 | – | 59th of 66 | 2093rd of 3,077 |
| Drought | 50 | 0 | – | 38th of 66 | 1336th of 3,063 |
| Tornadoes | 40 | 0 | $937K | 50th of 66 | 2291st of 3,080 |
| Floods | 38 | 2 | $5.8M | 40th of 66 | 2300th of 3,080 |
| Extreme cold | 25 | 0 | – | 49th of 66 | 1387th of 3,076 |
| Heat | 14 | 0 | – | 43rd of 66 | 1578th of 3,076 |
| Wildfires | 3 | 0 | – | 11th of 66 | 922nd 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 Lyman County record: every hazard by year and month, the deadliest events and FEMA's declarations.