The most recent reported hail day was 2026-03-22, 131 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 2020-03-28 near Rockdale.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Pennsylvania. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-03-22, around Butler. 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 ->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 82 separate reports between them, better than three on a typical one. 6 of those 17 years produced none at all. One year dominates the record: 2012 alone produced 6 of the 24 days. The last five years track the long-run rate, with 6 days since 2022.
3 of the 24 days reached 2 inches or more -- 12%, or about one hail day in 8, the last on 2024-04-14. Those big days do not follow the county's usual calendar: most of them fall in March, not April.
Across the whole of Pennsylvania, see the Pennsylvania hail map and history.
Reports cluster nearest Mars -- 4 of the county's 24 hail days -- then Zelienople (4), Butler (4), Chicora (3) and Slippery Rock (3). Beyond those, NOAA names West Sunbury, Harmony, Oak Hills, Portersville and Saxonburg on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Butler | 4 | 1.00″ |
| Chicora | 3 | 2.50″ |
| Slippery Rock | 3 | 1.75″ |
| Zelienople | 3 | 1.25″ |
| Mars | 3 | 1.00″ |
The season runs March through July: 20 of the 24 hail days on record fall in those 5 months (83%). April is the single busiest month, with 6 of them (25%). That peak sits inside the window rather than at either end. Hail has also been reported in August and October, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 4 |
| April | 6 |
| May | 5 |
| June | 1 |
| July | 4 |
| August | 3 |
| October | 1 |
That day put 1 report on the map, the biggest 1 inch near Butler. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-22 | 1.00″ | 1 |
| 2025-04-19 | 1.00″ | 1 |
| 2024-10-06 | 1.00″ | 1 |
| 2024-04-17 | 1.25″ | 2 |
| 2024-04-14 | 2.00″ | 21 |
| 2024-03-14 | 1.25″ | 2 |
| 2020-08-25 | 1.00″ | 1 |
| 2020-03-28 | 2.50″ | 12 |
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.
The nearest counties with a page of their own: Lawrence County (17 hail days), Beaver County (20) and Armstrong County (13). Butler County takes more hail than any of them.
Lawrence County · Beaver County · Armstrong County
Back to the Pennsylvania hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Butler County, Pennsylvania only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.