Hail history for Union County, PA

Union County has 15 recorded hail events in the NOAA Storm Events Database — 7 of them 1″ or larger and 1 at 2″ or larger. The largest on record: 2.5″ (tennis ball) on September 18, 1991.

Records 1950–present Data through April 2026 Peak month July

Core sample · every recorded event, 1955–2026

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.

Recorded events 15 since 1991

1″ or larger 7 NWS severe threshold

2″ or larger 1 hen egg class and up

Largest recorded 2.5″ tennis ball · September 18, 1991

Read the record honestly: Storm Events contains what was reported to the National Weather Service. Sparse or rural counties under-report, and coverage improved sharply after the mid-1990s — a quiet-looking stretch is not proof nothing fell.

When it hails in Union County

Recorded events by month, 1950–present. The amber bar marks Union County's peak: July.

Most recent recorded events

Latest 8 of 15 recorded events · data through April 2026
Date	Size	Comparable to
May 28, 2019	0.88″	Nickel
May 28, 2019	1.5″	Ping-pong ball
July 18, 2016	1.75″	Golf ball
May 31, 2015	1.0″	Quarter
August 7, 2008	0.75″	Penny
July 17, 2008	0.75″	Penny
June 19, 2007	1.0″	Quarter
June 19, 2007	0.75″	Penny

Looking for a specific storm? Use the did-it-hail date lookup for Union County.

From the storm reports

Narratives as filed with the NOAA Storm Events Database (public records; lightly trimmed for length).

May 28, 2019 · 1.5″ (ping-pong ball)

A severe thunderstorm produced ping-pong ball sized hail in Lewisburg.

July 18, 2016 · 1.75″ (golf ball)

A severe thunderstorm produced golf-ball sized hail near Allenwood.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	0	0	0	5	6	4	0

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 Union County

Has it ever hailed in Union County?

Yes — 15 hail events have been recorded for Union County, PA in the NOAA Storm Events Database since 1991, including 7 of 1″ (quarter size) or larger.

When did it last hail in Union County?

The most recent recorded hail event for Union County, PA is May 28, 2019, with 0.88″ (nickel) 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 Union County?

2.5″ (tennis ball), recorded on September 18, 1991. 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

All 67 Pennsylvania counties, ranked by recorded hail →

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.