The most recent reported hail day was 2026-04-15, 107 days ago. Mercer County is hit in most years. 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 2019-05-28 near Sandy Lake.
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 2026-04-15, around Orangeville. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Mercer 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 27 separate hail days here since 2010 -- 1.6 a year over 17 years of record. Those days carry 73 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 2019, with 5 hail days. The last five years track the long-run rate, with 6 days since 2022.
Most hail here stays under 2 inches: only 2 of the 27 days on record passed it, 7%, the last on 2022-06-16. They land in the same month as everything else, May. Golf-ball size is rarer still: 1.75 inches or more on 5 of the 27 days.
Across the whole of Pennsylvania, see the Pennsylvania hail map and history.
Reports cluster nearest Stoneboro -- 5 of the county's 27 hail days -- then Greenville (5), Mercer (5), Sandy Lake (3) and Transfer (3). Beyond those, NOAA names Grove City, Jackson Center, New Lebanon, Fredonia, Clark, Hermitage, Jamestown and Sharon on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Stoneboro | 4 | 2.25″ |
| Mercer | 4 | 1.25″ |
| Greenville | 3 | 1.75″ |
| Transfer | 3 | 1.75″ |
| Grove City | 3 | 1.25″ |
The season runs April through August: 23 of the 27 hail days on record fall in those 5 months (85%). May is the single busiest month, with 10 of them (37%). That peak sits inside the window rather than at either end. Hail has also been reported in January, September, October and November, outside that window. February, March and December are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| January | 1 |
| April | 4 |
| May | 10 |
| June | 3 |
| July | 3 |
| August | 3 |
| September | 1 |
| October | 1 |
| November | 1 |
That day put 8 reports on the map, the biggest 1.75 inches near Orangeville. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-15 | 1.75″ | 8 |
| 2025-05-02 | 1.25″ | 1 |
| 2024-10-06 | 1.00″ | 3 |
| 2024-04-14 | 1.00″ | 1 |
| 2022-06-16 | 2.50″ | 7 |
| 2022-05-01 | 1.00″ | 1 |
| 2019-08-15 | 1.00″ | 2 |
| 2019-06-01 | 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, over the state line included: Lawrence County (17 hail days), Venango County (18), Crawford County (25) and Trumbull County, Ohio (25). Mercer County takes more hail than any of them.
Lawrence County · Venango County · Crawford County · Trumbull County, Ohio
Back to the Pennsylvania hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Mercer County, Pennsylvania only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.