Hail history for Knox County, ME

Knox County has 11 recorded hail events in the NOAA Storm Events Database — 5 of them 1″ or larger. The largest on record: 1.25″ (half dollar) on September 24, 2019.

Records 1950–present Data through April 2026

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 11 since 1986

1″ or larger 5 NWS severe threshold

2″ or larger 0 hen egg class and up

Largest recorded 1.25″ half dollar · September 24, 2019

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.

Most recent recorded events

Latest 8 of 11 recorded events · data through April 2026
Date	Size	Comparable to
September 24, 2019	1.0″	Quarter
September 24, 2019	1.25″	Half dollar
September 24, 2019	1.0″	Quarter
September 24, 2019	1.0″	Quarter
August 6, 2016	0.88″	Nickel
August 6, 2016	1.0″	Quarter
July 6, 2007	0.88″	Nickel
July 6, 2007	0.75″	Penny

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

From the storm reports

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

September 24, 2019 · 1.25″ (half dollar)

Half dollar size hail reported in the northern portion of North Haven.

September 24, 2019 · 1.0″ (quarter)

Penny to quarter size hail piled up several inches in a few spots.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
0	0	0	1	2	2	6	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 Knox County

Has it ever hailed in Knox County?

Yes — 11 hail events have been recorded for Knox County, ME in the NOAA Storm Events Database since 1986, including 5 of 1″ (quarter size) or larger.

When did it last hail in Knox County?

The most recent recorded hail event for Knox County, ME is September 24, 2019, with 1.0″ (quarter) 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 Knox County?

1.25″ (half dollar), recorded on September 24, 2019. 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 Maine hail history

All 16 Maine 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.