Hail History

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Hail history for Jefferson, WI

Last hail within 10 milesApr 14, 20261.75 in (golf ball)
Hail days, last 12 months1
Largest hail since 20064.25 inMay 11, 2011
Hail days since 200631
Days with hail 1 inch or larger20
Tornadoes within 10 miles8
Damaging wind reports within 10 miles57

Hail has been reported within 10 miles of Jefferson on 31 days since 2006. The largest stones measured 4.25 in on May 11, 2011. Hail is most common here in June and April.

Recent hail near Jefferson

DateHail sizeWhereSource
Apr 14, 20261.75 in
golf ball		Grellton
1 hail report · closest 10 mi from Jefferson		NOAA Storm Events
Apr 18, 20252 in
hen egg		Cold Spg, Milford, Fort Atkinson
7 hail reports · closest 6 mi from Jefferson		NOAA Storm Events

One row per day: the largest hail reported that day within 10 miles, the places and the number of reports.

Hail days near Jefferson by year

406107408092103112121132141516317181920221122323124125126

When hail season peaks near Jefferson

Of the 31 hail days since 2006, most fell in June (10) and April (6).

Jan1Feb1Mar6Apr5May10Jun2Jul5AugSep1OctNovDec

Largest hail storms near Jefferson

May 11, 2011 · 4.25 in · Jefferson (4 mi from Jefferson)

National Weather Service description (English): Report from the public of baseball-sized hail that broke windows on homes and vehicles.

Apr 13, 2006 · 2.5 in (tennis ball) · Johnson Creek (6 mi from Jefferson)

National Weather Service description (English): Hail sizes ranged from 1.00 to 2.50 inches in diameter.

Apr 18, 2025 · 2 in (hen egg) · Cold Spg (8 mi from Jefferson)

National Weather Service description (English): Hail size measured around 2.34 inches in diameter.

Aug 24, 2006 · 1.75 in (golf ball) · Janesville (8 mi from Jefferson)

Jun 2, 2010 · 1.75 in (golf ball) · Lake Mills (7 mi from Jefferson)

Tornadoes within 10 miles of Jefferson

DateRatingWherePath
May 26, 2024EF0Lake Koshkonong
9 mi from Jefferson		5.5 mi long, 30 yd wide
Mar 31, 2023EF0Cambridge
10 mi from Jefferson		1.4 mi long, 75 yd wide
Oct 12, 2022EF0Aztalan
5 mi from Jefferson		0.4 mi long, 25 yd wide
Jul 29, 2021EF0Grellton
8 mi from Jefferson		3.6 mi long, 25 yd wide
Oct 1, 2019EF0Busseyville
10 mi from Jefferson		7.1 mi long, 80 yd wide
Oct 1, 2019EF1Sullivan
9 mi from Jefferson		4.4 mi long, 100 yd wide
Jul 22, 2010EF0Farmington
9 mi from Jefferson		0.1 mi long, 30 yd wide
Jun 7, 2008EF0Aztalan
6 mi from Jefferson		0.1 mi long, 50 yd wide

Damaging thunderstorm winds near Jefferson

57 reports of damaging thunderstorm wind within 10 miles of Jefferson since 2006, on 46 days. The strongest measured gust was 58 mph on May 22, 2011.

DateStrongest gustWhereSource
Jun 10, 202675 mph, estimatedFort Atkinson
1 wind report		NOAA Storm Events
Apr 14, 202681 mph, estimatedCambridge
1 wind report		NOAA Storm Events
Aug 24, 202358 mph, estimatedFort Atkinson, Jefferson
3 wind reports		NOAA Storm Events
Jul 28, 202375 mph, estimatedFort Atkinson
1 wind report		NOAA Storm Events
Oct 12, 202258 mph, estimatedJohnson Creek
1 wind report		NOAA Storm Events
Sep 25, 202258 mph, estimatedLake Mills
1 wind report		NOAA Storm Events
Jul 24, 202258 mph, estimatedFort Atkinson
1 wind report		NOAA Storm Events
Jun 15, 202258 mph, estimatedFort Atkinson Muni Airport
1 wind report		NOAA Storm Events
Jun 13, 202264 mph, estimatedLake Mills, Aztalan
2 wind reports		NOAA Storm Events
Aug 7, 202160 mph, estimatedFort Atkinson Muni Airport
1 wind report		NOAA Storm Events

Severe thunderstorm wind means gusts of 58 mph or more, or wind that caused damage. Measured gusts come from weather stations; estimated ones from spotters and damage surveys.

Filing a roof or car hail claim?

Insurers ask for the date of loss. The dates on this page are when hail was reported near Jefferson; hail can hit one street and miss the next, so a report is not proof of damage at your address. A licensed roofer or your insurance adjuster can inspect the roof. Many policies set a time limit for filing a claim — check yours.

Nearby cities

Data: NOAA NCEI Storm Events Database (final records through Jun 30, 2026) and National Weather Service Local Storm Reports (preliminary, since then). Distances are measured from the center of Jefferson.

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