Hail in Petroleum County, Montana

Hail in Petroleum County, Montana: 115 recorded events between 1963 and 2025. The strongest on record measured 3.5. That places the county #1,251 nationally and #29 statewide for this hazard.

Reporting practice changed over time — early decades are undercounted, not calmer.

The busiest decade for hail in Petroleum County is the 2000s, when 47 of the county's 115 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.

Within the Petroleum County archive, hail makes up 51.1% of all recorded severe weather across 9 hazard types. Nationally the county sits at #1,251 for this hazard and #29 within Montana, putting it in the 59.6 percentile of all U.S. counties.

Jul is the peak month for hail in Petroleum County with 47 recorded events, while Jan is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.

• Thunderstorm Wind 72

Written by National Weather Service staff at the time of the event · public domain

How many hail events are on record in Petroleum County, Montana?

115 hail events are recorded in Petroleum County between 1963 and 2025, causing 0 direct deaths.

What is the strongest hail recorded in Petroleum County?

The strongest hail on record in Petroleum County measured 3.5.

Where does the hail data for Petroleum County come from?

All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.