Hail history for Jefferson County, WI

Jefferson County has 176 recorded hail events in the NOAA Storm Events Database — 99 of them 1″ or larger and 17 at 2″ or larger. The largest on record: 4.25″ (grapefruit) on May 11, 2011.

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 176 since 1956

1″ or larger 99 NWS severe threshold

2″ or larger 17 hen egg class and up

Largest recorded 4.25″ grapefruit · May 11, 2011

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 Jefferson County

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

Most recent recorded events

Latest 8 of 176 recorded events · data through April 2026
Date	Size	Comparable to
April 14, 2026	1.0″	Quarter
April 14, 2026	2.75″	Baseball
April 14, 2026	1.0″	Quarter
April 14, 2026	1.75″	Golf ball
April 14, 2026	1.0″	Quarter
April 14, 2026	1.0″	Quarter
April 14, 2026	1.75″	Golf ball
April 14, 2026	1.25″	Half dollar

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

From the storm reports

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

April 14, 2026 · 2.75″ (baseball)

Trained spotter reports 2.75 inch diameter hail southeast of Watertown.

April 14, 2026 · 1.25″ (half dollar)

Public report of 1.25 inch diameter hail in Watertown.

May 11, 2011 · 2.75″ (baseball)

Report from the public of baseball-sized hail that broke windows on homes and vehicles.

Events by decade

1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s
1	2	6	4	16	67	39	41

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 Jefferson County

Has it ever hailed in Jefferson County?

Yes — 176 hail events have been recorded for Jefferson County, WI in the NOAA Storm Events Database since 1956, including 99 of 1″ (quarter size) or larger.

When did it last hail in Jefferson County?

The most recent recorded hail event for Jefferson County, WI is April 14, 2026, 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 Jefferson County?

4.25″ (grapefruit), recorded on May 11, 2011. 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 Wisconsin hail history

All 72 Wisconsin 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.