Heavy Rain in Marion County, Iowa

Heavy Rain in Marion County, Iowa: 107 recorded events between 2009 and 2025. The strongest on record measured 0. That places the county #24 nationally and #6 statewide for this hazard.

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

The busiest decade for heavy rain in Marion County is the 2010s, when 69 of the county's 107 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 Marion County archive, heavy rain makes up 15.1% of all recorded severe weather across 8 hazard types. Nationally the county sits at #24 for this hazard and #6 within Iowa, putting it in the 99.0 percentile of all U.S. counties.

Jul is the peak month for heavy rain in Marion County with 29 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 236
• Hail 196
• Flood 63
• Tornado 47

How many heavy rain events are on record in Marion County, Iowa?

107 heavy rain events are recorded in Marion County between 2009 and 2025, causing 0 direct deaths.

What is the strongest heavy rain recorded in Marion County?

The strongest heavy rain on record in Marion County measured 0.

Where does the heavy rain data for Marion 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.