The most recent reported hail day was 2024-07-06 -- 2 years ago, with nothing reported since. Hamilton County is hit in about half the years on record. The largest stone on record here is 2.75 inches, a baseball and 2.8 times the National Weather Service's 1 inch severe criterion, reported on 2014-06-30 near Stanhope.
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 2024-07-06, around Woolstock. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Hamilton 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 13 separate hail days here since 2010 -- 0.8 a year over 17 years of record. Those days carry 30 separate reports between them, two or three on a typical one. 9 of those 17 years produced none at all. One year dominates the record: 2014 alone produced 3 of the 13 days. The last five years have been quieter than the long run: 1 days since 2022, against 1.0 a year before that.
Most hail here stays under 2 inches: only 1 of the 13 days on record passed it, 8%, the last on 2014-06-30. They land in the same month as everything else, June. 4 of the 13 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 Jewell -- 5 of the county's 13 hail days -- then Stratford (4), Stanhope (3), Woolstock (2) and Kamrar (2). Beyond those, NOAA names Webster City and Webster City Airp on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Stanhope | 3 | 2.75″ |
| Jewell | 3 | 1.75″ |
| 1 S Stratford | 1 | 2.50″ |
| 1 S Woolstock | 1 | 1.75″ |
| 3 E Stanhope | 1 | 1.75″ |
The season runs April through August: 12 of the 13 hail days on record fall in those 5 months (92%). June is the single busiest month, with 3 of them (23%). That peak sits inside the window rather than at either end. Hail has also been reported in September, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| April | 2 |
| May | 2 |
| June | 3 |
| July | 3 |
| August | 2 |
| September | 1 |
That day put 1 report on the map, the biggest 1.25 inches near Woolstock. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2024-07-06 | 1.25″ | 1 |
| 2019-09-14 | 1.00″ | 1 |
| 2018-08-01 | 1.00″ | 1 |
| 2018-06-06 | 1.75″ | 6 |
| 2017-05-15 | 1.50″ | 2 |
| 2016-05-30 | 1.00″ | 1 |
| 2014-06-30 | 2.75″ | 5 |
| 2014-06-29 | 1.25″ | 1 |
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 2.75 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: Webster County (38 hail days), Boone County (25) and Story County (36). Every one of them takes more hail than Hamilton County.
Webster County · Boone County · Story 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, Hamilton County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.