234
Recorded events
0
Direct deaths
5
Direct injuries
$0
Property damage
Hail in Lyman County, South Dakota: 234 recorded events between 1957 and 2025. The strongest on record measured 8. That places the county #482 nationally and #24 statewide for this hazard.
Decade by decade
Hail in Lyman County, South Dakota: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for hail in Lyman County is the 2010s, when 84 of the county's 234 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the Lyman County archive, hail makes up 38.7% of all recorded severe weather across 7 hazard types. Nationally the county sits at #482 for this hazard and #24 within South Dakota, putting it in the 84.5 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for hail in Lyman County with 69 recorded events, while Jan is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Significant events
Deadliest on record
| Date | Location | Scale | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Jul 23, 2010 | VIVIAN | 8 | 0 | 5 | $0 |
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Aug 14, 2025 | VIVIAN | 1 | $0 |
| Aug 4, 2025 | KENNEBEC | 1.25 | $0 |
| Aug 4, 2025 | OACOMA | 1 | $0 |
| Jul 29, 2025 | RELIANCE ARPT | 1 | $0 |
| Jul 28, 2025 | LOWER BRULE | 1.75 | $0 |
| Jul 10, 2025 | LYMAN | 2.5 | $0 |
| Jun 28, 2025 | KENNEBEC | 1 | $0 |
| Aug 5, 2023 | PRESHO MUNI ARPT | 1.25 | $0 |
| Jul 19, 2023 | KENNEBEC | 1.5 | $0 |
| Jul 19, 2023 | LOWER BRULE | 1 | $0 |
Other hazards here
More from Lyman County
- Thunderstorm Wind 291
- Tornado 40
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
The eight inch diameter hailstone was a United States record. The hailstone also had a circumference of 18.625 inches and weighed 1.9375 pounds. The hailstone broke the previous United States record for diameter (7.0 inches – 22 June 2003 in Aurora, NE) and weight (1.67 pounds – 3 September 1970 in Coffeyville, KS). The Aurora, Nebraska hailstone will retain the record for circumference (18.75 inches). Extensive damage to buildings and vehicles had occurred with this record setting stone. Five minor injuries occurred on Interstate-90 as the large hailstones went through car windshields.
Quick answers
Frequently asked
How many hail events are on record in Lyman County, South Dakota?
234 hail events are recorded in Lyman County between 1957 and 2025, causing 0 direct deaths.
What is the strongest hail recorded in Lyman County?
The strongest hail on record in Lyman County measured 8.
Where does the hail data for Lyman County come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Hail in Lyman County, South Dakota.” Severe Weather History. severeweatherhistory.com/county/south-dakota/lyman-county/hail/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.