Heavy Rain in Story County, Iowa

Heavy Rain in Story County, Iowa: 174 recorded events between 2008 and 2024. The strongest on record measured 0. That places the county #10 nationally and #2 statewide for this hazard.

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

The busiest decade for heavy rain in Story County is the 2010s, when 139 of the county's 174 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 Story County archive, heavy rain makes up 15.8% of all recorded severe weather across 8 hazard types. Nationally the county sits at #10 for this hazard and #2 within Iowa, putting it in the 99.6 percentile of all U.S. counties.

Jul is the peak month for heavy rain in Story County with 42 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 390
• Hail 325
• Tornado 64
• Flash Flood 64
• Flood 53

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

174 heavy rain events are recorded in Story County between 2008 and 2024, causing 0 direct deaths.

What is the strongest heavy rain recorded in Story County?

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

Where does the heavy rain data for Story 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.