Butler County, Iowa Hail Map & History
Butler County was hit as recently as 2026-09-04, 10 days ago. Butler 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 2025-04-17 near Clarksville.
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 2026-09-04, around Parkersburg. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Butler 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 Butler County
NOAA's Storm Prediction Center has logged 24 separate hail days here since 2010 -- 1.4 a year over 17 years of record. Those days carry 60 separate reports between them, two or three on a typical one. 5 of those 17 years produced none at all. The busiest single year was 2026, with 4 hail days. The last five years track the long-run rate, with 8 days since 2022.
4 of the 24 days reached 2 inches or more -- 17%, or about one hail day in 6, the last on 2025-04-17. Those big days do not follow the county's usual calendar: most of them fall in April, not June. 6 of the 24 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Iowa, see the Iowa hail map and history.
Hardest-hit places in Butler County
Reports cluster nearest Clarksville -- 9 of the county's 24 hail days -- then Greene (6), Dumont (6), Parkersburg (5) and Aplington (4). Beyond those, NOAA names Allison, Bristow, Shell Rock and Aredale on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Greene | 4 | 1.75″ |
| 1 Nw Parkersburg | 3 | 1.50″ |
| Dumont | 3 | 1.00″ |
| 4 N Clarksville | 2 | 2.00″ |
| Aplington | 2 | 1.75″ |
When it hails in Butler County
The season runs April through August: 20 of the 24 hail days on record fall in those 5 months (83%). June is the single busiest month, with 9 of them (38%). That peak sits inside the window rather than at either end. Hail has also been reported in March and September, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 3 |
| May | 2 |
| June | 9 |
| July | 3 |
| August | 3 |
| September | 2 |
Recent Butler County hail days
That day put 2 reports on the map, the biggest 1.75 inches near Parkersburg. 4 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-09-04 | 1.75″ | 2 |
| 2026-08-07 | 1.25″ | 1 |
| 2026-06-10 | 1.00″ | 1 |
| 2026-04-14 | 1.75″ | 4 |
| 2025-08-15 | 1.00″ | 1 |
| 2025-04-17 | 2.50″ | 1 |
| 2023-06-24 | 1.00″ | 1 |
| 2022-06-14 | 1.00″ | 1 |
How to read the Butler 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: Bremer County (20 hail days), Floyd County (29) and Franklin County (22). Butler County sits in between.
Bremer County · Floyd County · Franklin County
Back to the Iowa hail map or the U.S. hail map.
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Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Butler County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.