Mellette County, South Dakota Hail Map & History
Mellette County was hit as recently as 2026-06-28, 78 days ago. Mellette County is hit in most years, and usually several times over. The largest stone on record here is 4.5 inches, a softball and 4.5 times the National Weather Service's 1 inch severe criterion, reported on 2020-08-26 near Norris.
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 2026-06-28, around White River. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Mellette 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 Mellette County
NOAA's Storm Prediction Center has logged 34 separate hail days here since 2010 -- 2.0 a year over 17 years of record. They carry 61 reports in total: most hail days here are logged from a single spot. 2 of those 17 years produced none at all. The busiest single year was 2019, with 5 hail days. The last five years track the long-run rate, with 9 days since 2022.
Most hail here stays under 2 inches: only 3 of the 34 days on record passed it, 9%, the last on 2020-08-26. Those big days do not follow the county's usual calendar: most of them fall in August, not July. Golf-ball size is rarer still: 1.75 inches or more on 5 of the 34 days.
Across the whole of South Dakota, see the South Dakota hail map and history.
Hardest-hit places in Mellette County
Reports cluster nearest White River -- 18 of the county's 34 hail days -- then Wood (12), Norris (7), Cedar Butte (7) and Mosher (2). That one town is named on 53% of them.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 5 ESE Norris | 4 | 2.50″ |
| White River | 4 | 1.50″ |
| 3 SSE White River | 2 | 1.00″ |
| 7 W Cedar Butte | 2 | 1.00″ |
| Wood | 2 | 1.00″ |
When it hails in Mellette County
The season runs June through August: 31 of the 34 hail days on record fall in those 3 months (91%). July is the single busiest month, with 11 of them (32%). That peak sits inside the window rather than at either end. Hail has also been reported in May and September, outside that window. Reports span 5 of the 12 calendar months; the other 7 have never produced one.
| Month | Hail days |
|---|---|
| May | 1 |
| June | 10 |
| July | 11 |
| August | 10 |
| September | 2 |
Recent Mellette County hail days
That day put 1 report on the map, the biggest 1 inch near White River. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-28 | 1.00″ | 1 |
| 2026-06-02 | 1.50″ | 1 |
| 2025-07-01 | 1.75″ | 1 |
| 2024-07-29 | 1.50″ | 2 |
| 2023-09-20 | 1.25″ | 1 |
| 2023-07-27 | 1.00″ | 1 |
| 2023-07-18 | 1.00″ | 1 |
| 2023-06-27 | 1.25″ | 1 |
How to read the Mellette 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 4.5 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: Jones County (41 hail days), Todd County (58) and Tripp County (47). Every one of them takes more hail than Mellette County.
Jones County · Todd County · Tripp 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, Mellette County, South Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.