44
Recorded events
0
Direct deaths
0
Direct injuries
$400K
Property damage
Heavy Rain in Pinal County, Arizona: 44 recorded events between 2004 and 2018. The strongest on record measured 0. That places the county #109 nationally and #6 statewide for this hazard.
Decade by decade
Heavy Rain in Pinal County, Arizona: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for heavy rain in Pinal County is the 2010s, when 37 of the county's 44 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 Pinal County archive, heavy rain makes up 5.9% of all recorded severe weather across 10 hazard types. Nationally the county sits at #109 for this hazard and #6 within Arizona, putting it in the 95.5 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for heavy rain in Pinal County with 22 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.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Oct 13, 2018 | CASA GRANDE | 0 | $0 |
| Aug 3, 2018 | STANFIELD | 0 | $0 |
| Jul 29, 2018 | KEARNY | 0 | $35K |
| Jul 29, 2018 | MAMMOTH | 0 | $50K |
| Jul 9, 2018 | FLORENCE | 0 | $0 |
| Sep 8, 2017 | PALM SPGS | 0 | $0 |
| Jul 22, 2017 | SUPERIOR | 0 | $0 |
| Jul 22, 2017 | SUPERIOR | 0 | $0 |
| Aug 9, 2016 | APACHE JCT | 0 | $0 |
| Jul 30, 2015 | SUPERIOR | 0 | $0 |
Other hazards here
More from Pinal County
- Thunderstorm Wind 409
- Flash Flood 131
- Hail 78
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
A cluster of thunderstorms developed in the area from Casa Grande southeast to Arizona City; the storms produced locally heavy rainfall during the late morning hours on July 4th. Radar estimates, as well as surrounding rain gage reports, suggested that three hourly totals between one and two inches occurred in the community of Arizona City between 9 am and noon. A weather report received via CoCoRaHS indicated 1.05 inches of rain fell in Arizona City, as of 9 am. Pinal county law enforcement reported road closures in Arizona City due to heavy rainfall. According to a local news report, a number of residents of Arizona City experienced significant urban flooding during the morning due to the heavy rains; water up to a foot deep flooded their subdivisions and flowed into their homes, causing water damage to the first floor as well as their patios/pavers. Insufficent drainage allowed the locally heavy rains to quickly pond up across the lower elevations of Arizona City, and the water levels remained high through the afternoon hours.
One to three inches of rain destabilized the soil that compromised the town of Mammoth's water system by creating fractures in the water system lines. This caused the system to be shut down and the town to declare a state of emergency.
A wet and slow moving Pacific low pressure system brought widespread showers, some with locally heavy rain, to the central Arizona deserts on December 13th. Rainfall continued through the morning hours on December 14th, and many lower desert locations recorded more than one inch of rainfall during the event. Local media reported that Hunt Highway, or State Route 87, was closed between Arizona Farms Road and Merrill Ranch Parkway due to surface damage to the road. The road was reported closed at 730 am on December 14th. The damage was due to the excessive rainfall that fell in the area. The location of the closure was south of the San Tan Valley.
Quick answers
Frequently asked
How many heavy rain events are on record in Pinal County, Arizona?
44 heavy rain events are recorded in Pinal County between 2004 and 2018, causing 0 direct deaths.
What is the strongest heavy rain recorded in Pinal County?
The strongest heavy rain on record in Pinal County measured 0.
Where does the heavy rain data for Pinal 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.
Cite this page
“Heavy Rain in Pinal County, Arizona.” Severe Weather History. severeweatherhistory.com/county/arizona/pinal-county/heavy-rain/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.