Hail History

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Hail history for Williams Bay, WI

Last hail within 10 milesAug 9, 20261.5 in (ping pong ball)
Hail days, last 12 months2
Largest hail since 20062.5 in (tennis ball)May 2, 2018
Hail days since 200628
Days with hail 1 inch or larger19
Tornadoes within 10 miles19
Damaging wind reports within 10 miles91

Hail has been reported within 10 miles of Williams Bay on 28 days since 2006. The largest stones measured 2.5 in (tennis ball) on May 2, 2018. Hail is most common here in May and July.

Recent hail near Williams Bay

DateHail sizeWhereSource
Aug 9, 20261.5 in
ping pong ball		Pell Lake, Lake Geneva, Fontana-on-Geneva
4 hail reports · closest 5 mi from Williams Bay		NWS storm report (preliminary)
Apr 15, 20261 in
quarter		Big Foot, Elkhorn Airport
2 hail reports · closest 5 mi from Williams Bay		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 Williams Bay by year

30610740809110111122131141151164171182191201211221232425226

When hail season peaks near Williams Bay

Of the 28 hail days since 2006, most fell in May (5) and July (5).

1JanFeb1Mar4Apr5May5Jun5Jul4Aug3SepOctNovDec

Largest hail storms near Williams Bay

May 2, 2018 · 2.5 in (tennis ball) · Williams Bay (1 mi from Williams Bay)

National Weather Service description (English): Wind driven ping pong size hail broke a window on the 90 foot dome of the Yerkes Observatory.

Aug 30, 2013 · 1.5 in (ping pong ball) · Delavan (6 mi from Williams Bay)

May 12, 2014 · 1.5 in (ping pong ball) · Elkhorn (6 mi from Williams Bay)

Sep 7, 2021 · 1.5 in (ping pong ball) · Delavan (6 mi from Williams Bay)

Aug 9, 2026 · 1.5 in (ping pong ball) · Pell Lake (7 mi from Williams Bay)

Tornadoes within 10 miles of Williams Bay

DateRatingWherePath
Apr 17, 2026EF1Delavan
9 mi from Williams Bay		2.7 mi long, 75 yd wide
Apr 15, 2026EF1Delavan Lake
9 mi from Williams Bay		2.8 mi long, 75 yd wide
Jun 22, 2024EF1Delavan Airport
5 mi from Williams Bay		6.0 mi long, 150 yd wide
Jun 22, 2024EF1Linton
3 mi from Williams Bay		5.3 mi long, 100 yd wide
May 7, 2024EF0Walworth Big Foot Airport
8 mi from Williams Bay		5.2 mi long, 50 yd wide
May 7, 2024EF1Darien
9 mi from Williams Bay		1.0 mi long, 50 yd wide
Jun 1, 2023EF?Walworth Big Foot Airport
8 mi from Williams Bay		0.0 mi long, 10 yd wide
Apr 5, 2023EF0Lake Geneva
7 mi from Williams Bay		0.5 mi long, 75 yd wide
Mar 31, 2023EF0Sharon
10 mi from Williams Bay		10.6 mi long, 100 yd wide
Mar 31, 2023EF0Walworth
6 mi from Williams Bay		7.0 mi long, 50 yd wide
Mar 31, 2023EF0Como
2 mi from Williams Bay		6.0 mi long, 150 yd wide
Oct 12, 2022EF0Lake Geneva Plyby Airport
8 mi from Williams Bay		2.4 mi long, 40 yd wide

Damaging thunderstorm winds near Williams Bay

91 reports of damaging thunderstorm wind within 10 miles of Williams Bay since 2006, on 60 days. The strongest measured gust was 74 mph on Aug 9, 2009.

DateStrongest gustWhereSource
Jul 3, 2026100 mph, estimatedDarien, Delavan Lake, Walworth
6 wind reports		NWS storm report (preliminary)
Jun 11, 202658 mph, estimatedFontana
1 wind report		NOAA Storm Events
Apr 17, 202663 mph, measuredAlden
1 wind report		NOAA Storm Events
Apr 2, 202658 mph, estimatedElkhorn
1 wind report		NOAA Storm Events
Jun 3, 202560 mph, estimatedWalworth Big Foot Airport
1 wind report		NOAA Storm Events
Mar 15, 202564 mph, estimatedHebron, Walworth Big Foot Airport
3 wind reports		NOAA Storm Events
Mar 14, 202563 mph, measuredWalworth Big Foot Airport
1 wind report		NOAA Storm Events
Jun 22, 202460 mph, estimatedHebron
1 wind report		NOAA Storm Events
May 22, 202458 mph, estimatedElkhorn Airport
1 wind report		NOAA Storm Events
May 21, 202458 mph, estimatedWanoawega
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 Williams Bay; 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 Williams Bay.

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