Hail History

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Hail history for Jefferson County, WI

Last hail in the countyJul 27, 20261.25 in (half dollar)
Hail days, last 12 months2
Largest hail since 20064.25 inMay 11, 2011
Hail days since 200647
Days with hail 1 inch or larger29
Tornadoes in the county24
Damaging wind reports in the county130

109 hail reports in Jefferson County since 2006 on 47 days. The largest stones measured 4.25 in on May 11, 2011.

Cities in Jefferson County

Recent hail in Jefferson County

DateHail sizeWhereSource
Jul 27, 20261.25 in
half dollar		Lac La Belle
1 hail report		NWS storm report (preliminary)
Apr 14, 20262.75 in
baseball		Watertown Airport, Grellton, Watertown
8 hail reports		NOAA Storm Events
May 15, 20252.5 in
tennis ball		Ixonia, Ixonia Airport
2 hail reports		NOAA Storm Events
Apr 18, 20252 in
hen egg		Cold Spg, Milford, Busseyville
13 hail reports		NOAA Storm Events

One row per day: the largest hail reported in the county that day, the places and the number of reports.

Hail days in Jefferson County by year

60630740809310411212113214115166171181920321122523124225226

When hail season peaks in Jefferson County

Jan1Feb2Mar9Apr9May10Jun6Jul5Aug3Sep2OctNovDec

Damaging thunderstorm winds in Jefferson County

130 reports of damaging thunderstorm wind in Jefferson County since 2006, on 78 days. The strongest measured gust was 64 mph on May 17, 2017.

DateStrongest gustWhereSource
Jul 2, 202655 mph, measuredWatertown
1 wind report		NWS storm report (preliminary)
Jun 10, 202685 mph, estimatedBusseyville, Fort Atkinson, Watertown Airport
3 wind reports		NOAA Storm Events
Apr 14, 202681 mph, estimatedWaterloo, Cambridge, Cambridge Airport
3 wind reports		NOAA Storm Events
Sep 22, 202558 mph, estimatedIxonia
1 wind report		NOAA Storm Events
Aug 12, 202560 mph, estimatedSullivan
1 wind report		NOAA Storm Events
Mar 15, 202563 mph, estimatedHubbleton, Concord, Waterloo
5 wind reports		NOAA Storm Events
Jun 21, 202458 mph, estimatedWaterloo
1 wind report		NOAA Storm Events
Jun 3, 202464 mph, estimatedLake Koshkonong
1 wind report		NOAA Storm Events
Aug 24, 202358 mph, estimatedJefferson, Fort Atkinson
3 wind reports		NOAA Storm Events
Jul 28, 202375 mph, estimatedFort Atkinson, Sullivan, Pipersville
5 wind reports		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 County; 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.

Data: NOAA NCEI Storm Events Database (final records through Jun 30, 2026) and National Weather Service Local Storm Reports (preliminary, since then).