The most recent reported hail day was 2025-07-16, 380 days ago. Allegheny County is hit in most years, and usually several times over. 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 2024-05-25 near Imperial.
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 2025-07-16, around Valencia. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Allegheny 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 40 separate hail days here since 2010 -- 2.4 a year over 17 years of record. Those days carry 182 separate reports between them, better than three on a typical one. 2 of those 17 years produced none at all. The busiest single year was 2013, with 6 hail days. The last five years track the long-run rate, with 10 days since 2022.
4 of the 40 days reached 2 inches or more -- 10%, or about one hail day in 10, the last on 2024-05-25. Those big days do not follow the county's usual calendar: most of them fall in May, not June. Golf-ball size is rarer still: 1.75 inches or more on 8 of the 40 days.
Across the whole of Pennsylvania, see the Pennsylvania hail map and history.
Reports cluster nearest Imperial -- 6 of the county's 40 hail days -- then Robinson Township (5), Ross Township (5), Bridgeville (4) and McKeesport (3). Beyond those, NOAA names North Versailles, Valencia, Gibsonia, Green Tree, Imperial-Enlow, Pittsburgh, Sygan, West View and Avalon on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Imperial | 6 | 2.00″ |
| Ross Township | 5 | 1.00″ |
| Robinson Township | 4 | 1.75″ |
| McKeesport | 3 | 2.00″ |
| North Versailles | 3 | 1.75″ |
The season runs April through August: 35 of the 40 hail days on record fall in those 5 months (88%). June is the single busiest month, with 10 of them (25%). 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 | 4 |
| April | 6 |
| May | 5 |
| June | 10 |
| July | 7 |
| August | 7 |
| September | 1 |
That day put 2 reports on the map, the biggest 1.25 inches near Valencia. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-07-16 | 1.25″ | 2 |
| 2025-04-02 | 1.75″ | 23 |
| 2025-03-16 | 1.25″ | 5 |
| 2024-08-29 | 1.00″ | 1 |
| 2024-08-06 | 1.00″ | 2 |
| 2024-05-25 | 2.00″ | 15 |
| 2024-04-14 | 1.00″ | 3 |
| 2023-08-12 | 1.00″ | 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 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: Washington County (23 hail days), Westmoreland County (37) and Beaver County (20). Allegheny County takes more hail than any of them.
Washington County · Westmoreland County · Beaver 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, Allegheny County, Pennsylvania only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.