Hail History

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Hail history for Lewis And Clark County, MT

Last hail in the countySep 13, 20260.5 in (marble)
Hail days, last 12 months3
Largest hail since 20061.75 in (golf ball)Aug 15, 2014
Hail days since 200631
Days with hail 1 inch or larger27
Damaging wind reports in the county87

53 hail reports in Lewis And Clark County since 2006 on 31 days. The largest stones measured 1.75 in (golf ball) on Aug 15, 2014.

Cities in Lewis And Clark County

Recent hail in Lewis And Clark County

DateHail sizeWhereSource
Sep 13, 20260.5 in
marble		East Helena
1 hail report		NWS storm report (preliminary)
Sep 6, 20261 in
quarter		Wolf Creek, Craig, Marysville
3 hail reports		NWS storm report (preliminary)
Jun 25, 20261 in
quarter		Iron, Helena Rgnl Airport, East Helena
3 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 Lewis And Clark County by year

06207308109210111212413214151162172181191201212222312425326

When hail season peaks in Lewis And Clark County

JanFebMarApr5May9Jun9Jul5Aug3SepOctNovDec

Damaging thunderstorm winds in Lewis And Clark County

87 reports of damaging thunderstorm wind in Lewis And Clark County since 2006, on 51 days. The strongest measured gust was 87 mph on Jun 29, 2010.

DateStrongest gustWhereSource
Sep 2, 202673 mph, measuredHelena, Augusta, Wolf Creek
10 wind reports		NWS storm report (preliminary)
Aug 29, 202658 mph, measuredWolf Creek
1 wind report		NWS storm report (preliminary)
Aug 28, 202654 mph, measuredHelena
1 wind report		NWS storm report (preliminary)
Aug 27, 202651 mph, measuredSimms
1 wind report		NWS storm report (preliminary)
Aug 26, 202648 mph, measuredHelena
1 wind report		NWS storm report (preliminary)
Jul 30, 202654 mph, measuredHelena, Wolf Creek
2 wind reports		NWS storm report (preliminary)
Jul 23, 202662 mph, measuredHelena, Marysville
3 wind reports		NWS storm report (preliminary)
Sep 14, 202559 mph, measuredAugusta Airport, Iron
2 wind reports		NOAA Storm Events
Jul 2, 202560 mph, measuredHelena Rgnl Airport, Augusta Airport
2 wind reports		NOAA Storm Events
May 29, 202561 mph, measuredAugusta 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 Lewis And Clark 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).