The most recent reported hail day was 2026-03-10, 143 days ago. Clinton County is hit in most years. The largest stone on record here is 2 inches, a hen egg and twice the National Weather Service's 1 inch severe criterion, reported on 2015-07-13 near Calamus.
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 2026-03-10, around Clinton. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Clinton 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 23 separate hail days here since 2010 -- 1.4 a year over 17 years of record. Those days carry 47 separate reports between them, two or three on a typical one. 4 of those 17 years produced none at all. The busiest single year was 2017, with 3 hail days. The last five years track the long-run rate, with 8 days since 2022.
Most hail here stays under 2 inches: only 2 of the 23 days on record passed it, 9%, the last on 2015-07-13. Those big days do not follow the county's usual calendar: most of them fall in April, not May. Golf-ball size is rarer still: 1.75 inches or more on 5 of the 23 days.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Clinton -- 8 of the county's 23 hail days -- then Camanche (5), Calamus (4), Dewitt (4) and Wheatland (4). Beyond those, NOAA names Grand Mound and Delmar on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Clinton | 4 | 1.75″ |
| Camanche | 4 | 1.50″ |
| Calamus | 3 | 2.00″ |
| Dewitt | 3 | 2.00″ |
| Wheatland | 2 | 1.25″ |
The season runs March through July: 19 of the 23 hail days on record fall in those 5 months (83%). May is the single busiest month, with 7 of them (30%). That peak sits inside the window rather than at either end. Hail has also been reported in February, August and November, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| February | 1 |
| March | 4 |
| April | 3 |
| May | 7 |
| June | 3 |
| July | 2 |
| August | 2 |
| November | 1 |
That day put 3 reports on the map, the biggest 1.25 inches near Clinton. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-10 | 1.25″ | 3 |
| 2025-07-10 | 1.75″ | 1 |
| 2025-03-19 | 1.00″ | 1 |
| 2024-05-21 | 1.50″ | 1 |
| 2024-05-19 | 1.25″ | 1 |
| 2023-05-07 | 1.25″ | 1 |
| 2023-04-19 | 1.00″ | 1 |
| 2022-11-04 | 1.00″ | 2 |
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 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, over the state line included: Scott County (31 hail days), Cedar County (24), Jones County (21), Rock Island County, Illinois (24) and Whiteside County, Illinois (26). Clinton County sits in between.
Scott County · Cedar County · Jones County · Rock Island County, Illinois · Whiteside County, Illinois
Back to the Iowa hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Clinton County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.