Heavy Rain in Union County, Iowa

Heavy Rain in Union County, Iowa: 59 recorded events between 2008 and 2025. The strongest on record measured 0. That places the county #74 nationally and #20 statewide for this hazard.

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

The busiest decade for heavy rain in Union County is the 2010s, when 46 of the county's 59 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 Union County archive, heavy rain makes up 14.5% of all recorded severe weather across 8 hazard types. Nationally the county sits at #74 for this hazard and #20 within Iowa, putting it in the 96.9 percentile of all U.S. counties.

Sep is the peak month for heavy rain in Union County with 15 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 138
• Hail 120
• Tornado 42

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

59 heavy rain events are recorded in Union County between 2008 and 2025, causing 0 direct deaths.

What is the strongest heavy rain recorded in Union County?

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

Where does the heavy rain data for Union 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.