Hail History

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Hail history for Petroleum County, MT

Last hail in the countyJul 17, 20251.75 in (golf ball)
Hail days, last 12 monthsNone
Largest hail since 20063.5 inJun 15, 2025
Hail days since 200640
Days with hail 1 inch or larger33
Tornadoes in the county2
Damaging wind reports in the county62

61 hail reports in Petroleum County since 2006 on 40 days. The largest stones measured 3.5 in on Jun 15, 2025.

Recent hail in Petroleum County

DateHail sizeWhereSource
Jul 17, 20252 in
hen egg		Flatwillow, Winnett
2 hail reports		NOAA Storm Events
Jun 15, 20253.5 inWinnett
5 hail reports		NOAA Storm Events
Jun 13, 20251 in
quarter		Winnett
1 hail report		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 Petroleum County by year

064074080911051121231314154163172182192202212221232432526

When hail season peaks in Petroleum County

JanFebMar2Apr2May17Jun14Jul4Aug1SepOctNovDec

Damaging thunderstorm winds in Petroleum County

62 reports of damaging thunderstorm wind in Petroleum County since 2006, on 35 days. The strongest measured gust was 78 mph on Jul 14, 2019.

DateStrongest gustWhereSource
Sep 7, 202663 mph, measuredWinnett
1 wind report		NWS storm report (preliminary)
Aug 23, 202673 mph, measuredTiegen
1 wind report		NWS storm report (preliminary)
Aug 18, 202660 mph, measuredWinnett, Mosby, Tiegen
3 wind reports		NWS storm report (preliminary)
Jul 25, 202652 mph, measuredCat Creek
1 wind report		NWS storm report (preliminary)
Jul 14, 202663 mph, measuredWinnett, Mosby
2 wind reports		NWS storm report (preliminary)
Jul 12, 202672 mph, measuredWinnett, Tiegen
2 wind reports		NWS storm report (preliminary)
Jul 5, 202658 mph, measuredTiegen
1 wind report		NWS storm report (preliminary)
Jul 2, 202661 mph, measuredWinnett, Cat Creek
2 wind reports		NWS storm report (preliminary)
May 13, 202672 mph, measuredTeigen, Dry Blood Creek Raws, Winnett
8 wind reports		NOAA Storm Events
Apr 11, 202664 mph, measuredWinnett
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 Petroleum 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).