HailHistory › Hail by county › Pennsylvania › Allegheny County
Pennsylvania · county FIPS 42003
Hail history for Allegheny County, PA
Allegheny County has 445 recorded hail events in the NOAA Storm Events Database — 247 of them 1″ or larger and 9 at 2″ or larger. The largest on record: 2.5″ (tennis ball) on April 14, 1984.
Mark size = measured hail diameter; slivers are events with no recorded size. Amber ≥2″, red ≥2.75″ (baseball class). Denser recent decades partly reflect better reporting, not only more storms.
When it hails in Allegheny County
Recorded events by month, 1950–present. The amber bar marks Allegheny County's peak: June.
Most recent recorded events
| Date | Size | Comparable to |
|---|---|---|
| 1.25″ | Half dollar | |
| 1.5″ | Ping-pong ball | |
| 1.0″ | Quarter | |
| 1.75″ | Golf ball | |
| 1.5″ | Ping-pong ball | |
| 1.25″ | Half dollar | |
| 1.5″ | Ping-pong ball | |
| 1.0″ | Quarter |
Looking for a specific storm? Use the did-it-hail date lookup for Allegheny County.
From the storm reports
Narratives as filed with the NOAA Storm Events Database (public records; lightly trimmed for length).
· 1.0″ (quarter)
Hail was observed at the corner of 9th Avenue and Prospect Street.
· 1.75″ (golf ball)
Hail was reported at the Imperial VFD.
· 2.0″ (hen egg)
A citizen reported hail 2.00 inches on social media.
Events by decade
| 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|
| 0 | 8 | 16 | 20 | 55 | 87 | 160 | 99 |
The climb across decades is largely a reporting story: spotter networks, radar, and digital filing pulled far more storms into the record after the 1990s.
Questions about hail in Allegheny County
Has it ever hailed in Allegheny County?
Yes — 445 hail events have been recorded for Allegheny County, PA in the NOAA Storm Events Database since 1962, including 247 of 1″ (quarter size) or larger.
When did it last hail in Allegheny County?
The most recent recorded hail event for Allegheny County, PA is July 16, 2025, with 1.25″ (half dollar) hail. The database is currently updated through April 2026, so a storm from the last few weeks may not appear yet. To check a specific day, use the did-it-hail date lookup.
What is the largest hail ever recorded in Allegheny County?
2.5″ (tennis ball), recorded on April 14, 1984. Hail that size meets or exceeds the National Weather Service severe threshold. See how big that really is on the actual-size hail chart.
Does a recorded hail event mean my roof was damaged?
No. This page reports storm records, not damage. Hail size and damage vary block by block within a county, and only an inspection can establish what happened to a specific roof. If you suspect damage, talk to your insurer or a licensed roofer — they can pull the same NOAA records for your claim.
More Pennsylvania hail history
- Westmoreland County 291
- Erie County 204
- Butler County 201
- Lancaster County 192
- Crawford County 185
- York County 164
Source: NOAA/NCEI Storm Events Database, public domain, updated monthly by NCEI — this site's copy runs through April 2026. HailHistory reports records; it does not give insurance advice or assess damage.