The most recent reported hail day was 2026-03-22, 131 days ago. Jefferson County is hit in about half the years on record. The largest stone on record here is 1.75 inches, a golf ball and 1.8 times the National Weather Service's 1 inch severe criterion, reported on 2026-03-22 near Brookville.
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 Brookville. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Jefferson 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 17 separate hail days here since 2010 -- 1.0 a year over 17 years of record. They carry 28 reports in total: most hail days here are logged from a single spot. 7 of those 17 years produced none at all. The busiest single year was 2012, with 3 hail days. The last five years have been quieter than the long run: 2 days since 2022, against 1.2 a year before that.
No stone of 2 inches or more has ever been reported in Jefferson County: all 17 hail days on record topped out below that. 6 of the 17 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Pennsylvania, see the Pennsylvania hail map and history.
Reports cluster nearest Sigel -- 4 of the county's 17 hail days -- then Brockway (4), Brookville (2), Reynoldsville (2) and Sykesville (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Brockway | 4 | 1.50″ |
| Brookville | 2 | 1.00″ |
| Sykesville | 2 | 1.00″ |
| 2 Sw Reynoldsville | 1 | 1.75″ |
| 2 W Brookville | 1 | 1.75″ |
The season runs March through August: 14 of the 17 hail days on record fall in those 6 months (82%). May is the single busiest month, with 6 of them (35%). That peak sits inside the window rather than at either end. Hail has also been reported in September and October, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| March | 2 |
| April | 2 |
| May | 6 |
| June | 1 |
| July | 1 |
| August | 2 |
| September | 2 |
| October | 1 |
That day put 3 reports on the map, the biggest 1.75 inches near Brookville. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-03-22 | 1.75″ | 3 |
| 2024-04-14 | 1.00″ | 2 |
| 2021-09-13 | 1.00″ | 1 |
| 2021-05-26 | 1.00″ | 1 |
| 2019-08-18 | 1.00″ | 1 |
| 2019-05-28 | 1.75″ | 1 |
| 2018-10-02 | 1.75″ | 2 |
| 2018-05-15 | 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 1.75 inches, which is the red band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Clarion County (16 hail days), Indiana County (20) and Armstrong County (13). Jefferson County sits in between.
Clarion County · Indiana 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, Jefferson County, Pennsylvania only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.