Clay County was hit as recently as 2026-06-28, 33 days ago. Clay County is hit in most years. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2024-05-20 near Royal.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Iowa. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-06-28, around Webb. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Clay 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 ->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 50 reports in total: most hail days here are logged from a single spot. 3 of those 17 years produced none at all. One year dominates the record: 2018 alone produced 6 of the 30 days. The last five years track the long-run rate, with 10 days since 2022.
Most hail here stays under 2 inches: only 1 of the 30 days on record passed it, 3%, the last on 2024-05-20. Those big days do not follow the county's usual calendar: most of them fall in May, not June. 8 of the 30 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Spencer -- 8 of the county's 30 hail days -- then Dickens (5), Peterson (4), Everly (4) and Webb (4). Beyond those, NOAA names Greenville, Gillett Grove and Terril on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Spencer | 5 | 1.75″ |
| Webb | 3 | 1.50″ |
| 5 Ssw Terril | 2 | 1.75″ |
| Everly | 2 | 1.50″ |
| Peterson | 2 | 1.25″ |
The season runs April through August: 25 of the 30 hail days on record fall in those 5 months (83%). June is the single busiest month, with 12 of them (40%). 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 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| April | 5 |
| May | 4 |
| June | 12 |
| July | 2 |
| August | 2 |
| September | 3 |
| October | 2 |
That day put 1 report on the map, the biggest 1.5 inches near Webb. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-28 | 1.50″ | 1 |
| 2026-05-15 | 1.25″ | 1 |
| 2026-04-13 | 1.50″ | 3 |
| 2025-04-28 | 1.50″ | 2 |
| 2024-06-21 | 1.00″ | 2 |
| 2024-06-17 | 1.00″ | 1 |
| 2024-05-23 | 1.75″ | 1 |
| 2024-05-20 | 3.00″ | 6 |
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 3 inches, which is the purple band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Dickinson County (22 hail days), Palo Alto County (25) and Buena Vista County (20). Clay County takes more hail than any of them.
Dickinson County · Palo Alto County · Buena Vista County
Back to the Iowa hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Clay County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.