Hail history for Harmon County, OK

Harmon County has 284 recorded hail events in the NOAA Storm Events Database — 176 of them 1″ or larger and 35 at 2″ or larger. The largest on record: 4.25″ (grapefruit) on May 9, 2006.

Records 1950–present Data through April 2026 Peak month May

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 284 since 1960

1″ or larger 176 NWS severe threshold

2″ or larger 35 hen egg class and up

Largest recorded 4.25″ grapefruit · May 9, 2006

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 Harmon County

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

Most recent recorded events

Latest 8 of 284 recorded events · data through April 2026
Date	Size	Comparable to
May 23, 2024	2.52″	Tennis ball
May 23, 2024	2.5″	Tennis ball
May 23, 2024	1.75″	Golf ball
May 23, 2024	1.0″	Quarter
May 23, 2024	1.75″	Golf ball
May 23, 2024	1.25″	Half dollar
May 23, 2024	2.75″	Baseball
February 2, 2024	1.25″	Half dollar

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

From the storm reports

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

May 23, 2024 · 2.75″ (baseball)

Social media image with ruler measurement.

April 28, 2006 · 2.75″ (baseball)

Hail was reported on Highway 9. Hail broke several car windshields.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	13	7	48	68	83	54	11

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 Harmon County

Has it ever hailed in Harmon County?

Yes — 284 hail events have been recorded for Harmon County, OK in the NOAA Storm Events Database since 1960, including 176 of 1″ (quarter size) or larger.

When did it last hail in Harmon County?

The most recent recorded hail event for Harmon County, OK is May 23, 2024, with 2.52″ (tennis ball) 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 Harmon County?

4.25″ (grapefruit), recorded on May 9, 2006. Hail that size is destructive-class and typically damages roofs, vehicles, and siding. 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 Oklahoma hail history

All 77 Oklahoma 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.