Clarion County was hit as recently as 2026-05-13, 79 days ago. Clarion 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 2015-08-03 near Callensburg.
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 2026-05-13, around Clarion. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Clarion 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 16 separate hail days here since 2010 -- 0.9 a year over 17 years of record. Those days carry 39 separate reports between them, two or three on a typical one. 6 of those 17 years produced none at all. The busiest single year was 2026, with 2 hail days. The last five years track the long-run rate, with 5 days since 2022.
2 of the 16 days reached 2 inches or more -- 12%, or about one hail day in 8, the last on 2017-04-20. 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 3 of the 16 days.
Across the whole of Pennsylvania, see the Pennsylvania hail map and history.
Reports cluster nearest Clarion -- 4 of the county's 16 hail days -- then Callensburg (2), Limestone (2), East Brady (2) and Sigel (2). Beyond those, NOAA names Strattanville on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Clarion | 3 | 1.75″ |
| Callensburg | 2 | 2.50″ |
| East Brady | 2 | 1.50″ |
| Crates | 1 | 2.00″ |
| Limestone | 1 | 1.75″ |
The season runs April through June: 13 of the 16 hail days on record fall in those 3 months (81%). May is the single busiest month, with 5 of them (31%). That peak sits inside the window rather than at either end. Hail has also been reported in January, March and August, outside that window. Reports span 6 of the 12 calendar months; the other 6 have never produced one.
| Month | Hail days |
|---|---|
| January | 1 |
| March | 1 |
| April | 4 |
| May | 5 |
| June | 4 |
| August | 1 |
That day put 1 report on the map, the biggest 1 inch near Clarion. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-05-13 | 1.00″ | 1 |
| 2026-03-22 | 1.50″ | 4 |
| 2025-06-09 | 1.50″ | 1 |
| 2024-04-17 | 1.00″ | 4 |
| 2024-04-14 | 1.25″ | 5 |
| 2019-05-28 | 1.00″ | 3 |
| 2019-01-08 | 1.25″ | 4 |
| 2018-05-15 | 1.75″ | 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 2.5 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: Armstrong County (13 hail days), Jefferson County (17) and Venango County (18). Clarion County sits in between.
Armstrong County · Jefferson County · Venango 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, Clarion County, Pennsylvania only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.