Heavy Rain in Warren County, Iowa

Heavy Rain in Warren County, Iowa: 122 recorded events between 2001 and 2025. The strongest on record measured 2.5. That places the county #20 nationally and #4 statewide for this hazard.

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

The busiest decade for heavy rain in Warren County is the 2010s, when 93 of the county's 122 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 Warren County archive, heavy rain makes up 13.8% of all recorded severe weather across 8 hazard types. Nationally the county sits at #20 for this hazard and #4 within Iowa, putting it in the 99.2 percentile of all U.S. counties.

Jul is the peak month for heavy rain in Warren County with 36 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 338
• Thunderstorm Wind 233
• Flood 79
• Tornado 48

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

122 heavy rain events are recorded in Warren County between 2001 and 2025, causing 0 direct deaths.

What is the strongest heavy rain recorded in Warren County?

The strongest heavy rain on record in Warren County measured 2.5.

Where does the heavy rain data for Warren 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.