Thunderstorm Wind in Grundy County, Iowa

Thunderstorm Wind in Grundy County, Iowa: 120 recorded events between 1960 and 2025. The strongest on record measured 80. That places the county #1,935 nationally and #70 statewide for this hazard.

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

The busiest decade for thunderstorm wind in Grundy County is the 2000s, when 35 of the county's 120 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 Grundy County archive, thunderstorm wind makes up 34.3% of all recorded severe weather across 8 hazard types. Nationally the county sits at #1,935 for this hazard and #70 within Iowa, putting it in the 38.6 percentile of all U.S. counties.

Jun is the peak month for thunderstorm wind in Grundy County with 45 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.

• Hail 91
• Heavy Rain 50
• Tornado 41

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

How many thunderstorm wind events are on record in Grundy County, Iowa?

120 thunderstorm wind events are recorded in Grundy County between 1960 and 2025, causing 0 direct deaths.

What is the strongest thunderstorm wind recorded in Grundy County?

The strongest thunderstorm wind on record in Grundy County measured 80.

Where does the thunderstorm wind data for Grundy 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.