Hamlin County, South Dakota Hail Map & History
The most recent reported hail day was 2026-06-03, 103 days ago. Hamlin County is hit in most years. The largest stone on record here is 2.5 inches, a tennis ball and 2.5 times the National Weather Service's 1 inch severe criterion, reported on 2013-06-21 near Lake Norden.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in South Dakota. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-06-03, around Thomas. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Hamlin County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
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See call-center options ->How often it hails in Hamlin County
NOAA's Storm Prediction Center has logged 30 separate hail days here since 2010 -- 1.8 a year over 17 years of record. They carry 53 reports in total: most hail days here are logged from a single spot. 4 of those 17 years produced none at all. The busiest single year was 2025, with 4 hail days. The last five years track the long-run rate, with 7 days since 2022.
Most hail here stays under 2 inches: only 2 of the 30 days on record passed it, 7%, the last on 2013-06-21. Those big days do not follow the county's usual calendar: most of them fall in June, not July. 8 of the 30 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of South Dakota, see the South Dakota hail map and history.
Hardest-hit places in Hamlin County
Reports cluster nearest Hayti -- 9 of the county's 30 hail days -- then Hazel (8), Stone Bridge (7), Lake Norden (6) and Estelline (5). Beyond those, NOAA names Castlewood and Thomas on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Hazel | 4 | 1.50″ |
| Estelline | 3 | 1.75″ |
| Hayti | 3 | 1.75″ |
| 1 S Hayti | 2 | 1.00″ |
| 2 S Thomas | 2 | 1.00″ |
When it hails in Hamlin County
The season runs May through August: 25 of the 30 hail days on record fall in those 4 months (83%). July is the single busiest month, with 8 of them (27%). That peak sits inside the window rather than at either end. Hail has also been reported in September and October, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| May | 7 |
| June | 7 |
| July | 8 |
| August | 3 |
| September | 4 |
| October | 1 |
Recent Hamlin County hail days
That day put 1 report on the map, the biggest 1 inch near Thomas. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-03 | 1.00″ | 1 |
| 2025-09-02 | 1.00″ | 1 |
| 2025-07-27 | 1.75″ | 3 |
| 2025-07-07 | 1.00″ | 1 |
| 2025-06-28 | 1.00″ | 3 |
| 2022-05-30 | 1.00″ | 2 |
| 2022-05-11 | 1.25″ | 3 |
| 2021-10-09 | 1.00″ | 2 |
How to read the Hamlin County map
The colored swath is NOAA's MRMS radar estimate of the largest hail per ~1 km cell; the dots are SPC ground reports. Yellow is about an inch, red 1.5 to 2″, purple 2″ and up (hail size vs roof damage). On this county's worst day the reports reached 2.5 inches, which is the purple band. Look up a street address with the hail history by address tool.
Nearby counties
The nearest counties with a page of their own: Codington County (39 hail days), Kingsbury County (23) and Deuel County (23). Hamlin County sits in between.
Codington County · Kingsbury County · Deuel County
Back to the South Dakota hail map or the U.S. hail map.
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Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Hamlin County, South Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.