Hail History

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Hail history for Rock Valley, IA

Last hail within 10 milesJun 28, 20261 in (quarter)
Hail days, last 12 months3
Largest hail since 20062.5 in (tennis ball)Aug 18, 2022
Hail days since 200632
Days with hail 1 inch or larger25
Tornadoes within 10 miles10
Damaging wind reports within 10 miles52

Hail has been reported within 10 miles of Rock Valley on 32 days since 2006. The largest stones measured 2.5 in (tennis ball) on Aug 18, 2022. Hail is most common here in June and August.

Recent hail near Rock Valley

DateHail sizeWhereSource
Jun 28, 20261.5 in
ping pong ball		Hull, Rock Vly
3 hail reports · closest near the center of Rock Valley		NOAA Storm Events
May 24, 20261 in
quarter		Alvord
1 hail report · closest 9 mi from Rock Valley		NOAA Storm Events
May 17, 20260.75 in
penny		Rock Vly
1 hail report · closest near the center of Rock Valley		NOAA Storm Events
Sep 21, 20251.75 in
golf ball		Lebanon
1 hail report · closest 9 mi from Rock Valley		NOAA Storm Events
Jun 2, 20251.75 in
golf ball		Lebanon, Doon, Hull
6 hail reports · closest 7 mi from Rock Valley		NOAA Storm Events
Apr 28, 20251 in
quarter		Hudson, Doon
2 hail reports · closest 6 mi from Rock Valley		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 Rock Valley by year

1063071083092101113121133141516173181912012112222324325326

When hail season peaks near Rock Valley

Of the 32 hail days since 2006, most fell in June (7) and August (7).

JanFebMar3Apr7May7Jun3Jul7Aug4Sep1OctNovDec

Largest hail storms near Rock Valley

Aug 18, 2022 · 2.5 in (tennis ball) · Lebanon (8 mi from Rock Valley)

National Weather Service description (English): Crop damage is an estimate from insured losses. Information provided by the United States Department of Agriculture.

May 1, 2012 · 2 in (hen egg) · Alvord (7 mi from Rock Valley)

National Weather Service description (English): Large hail was accompanied by strong winds. Leaves were stripped from numerous trees.

Jun 10, 2007 · 1.75 in (golf ball) · Rock Vly (0 mi from Rock Valley)

Sep 30, 2007 · 1.75 in (golf ball) · Rock Vly (5 mi from Rock Valley)

Jul 9, 2009 · 1.75 in (golf ball) · Rock Vly (0 mi from Rock Valley)

National Weather Service description (English): Large hail damaged vehicles and windows in the town of Rock Valley. the amount of damage was not known.

Tornadoes within 10 miles of Rock Valley

DateRatingWherePath
Jul 28, 2025EF1Alvord
10 mi from Rock Valley		2.1 mi long, 250 yd wide
Apr 16, 2024EF0Sioux Center
9 mi from Rock Valley		0.9 mi long, 25 yd wide
Apr 16, 2024EF0Sioux Center Muni Airport
9 mi from Rock Valley		0.2 mi long, 25 yd wide
May 30, 2022EF0Doon
6 mi from Rock Valley		0.5 mi long, 60 yd wide
May 10, 2015EF0Fairview
8 mi from Rock Valley		0.8 mi long, 50 yd wide
Jun 21, 2009EF0Doon
7 mi from Rock Valley		0.4 mi long, 50 yd wide
May 1, 2008EF2Rock Vly
4 mi from Rock Valley		8.9 mi long, 400 yd wide
May 1, 2008EF1Inwood
5 mi from Rock Valley		4.1 mi long, 200 yd wide
May 1, 2008EF0Doon
7 mi from Rock Valley		0.1 mi long, 50 yd wide
Sep 30, 2007EF0Rock Vly
5 mi from Rock Valley		0.1 mi long, 50 yd wide

Damaging thunderstorm winds near Rock Valley

52 reports of damaging thunderstorm wind within 10 miles of Rock Valley since 2006, on 31 days. The strongest measured gust was 81 mph on Sep 1, 2026.

DateStrongest gustWhereSource
Sep 1, 202681 mph, measuredHawarden, Hull
2 wind reports		NWS storm report (preliminary)
Jul 25, 202670 mph, measuredInwood
2 wind reports		NWS storm report (preliminary)
Jul 1, 202663 mph, estimatedIreton
1 wind report		NWS storm report (preliminary)
Jun 17, 202664 mph, estimatedRock Vly
1 wind report		NOAA Storm Events
Jul 28, 202596 mph, estimatedLebanon, Hudson, Rock Vly
8 wind reports		NOAA Storm Events
Jul 14, 202481 mph, estimatedHull, Rock Vly
2 wind reports		NOAA Storm Events
May 6, 202481 mph, estimatedAlvord
1 wind report		NOAA Storm Events
Jul 12, 202370 mph, estimatedRock Vly, Hull
2 wind reports		NOAA Storm Events
Jul 10, 202370 mph, estimatedRock Vly
1 wind report		NOAA Storm Events
Jun 24, 202370 mph, estimatedRock Vly, Hull
3 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 Rock Valley; 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 Rock Valley.

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