The most recent reported hail day was 2025-05-19 -- 1 year ago, with nothing reported since. Decatur County is hit in about half the years on record. The largest stone on record here is 2.5 inches, a tennis ball and 2.5 times the National Weather Service's 1 inch severe criterion, reported on 2014-06-03 near Lamoni.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Iowa. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2025-05-19, around Grand River. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Decatur County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
Get free access Check an addressOur US-based call center calls the homeowners in this storm and books roof inspections straight onto your calendar. You work the storm; we fill the schedule. We dial -- you do not have to knock a single door.
See call-center options ->NOAA's Storm Prediction Center has logged 15 separate hail days here since 2010 -- 0.9 a year over 17 years of record. They carry 21 reports in total: most hail days here are logged from a single spot. 7 of those 17 years produced none at all. One year dominates the record: 2015 alone produced 4 of the 15 days. The last five years have been quieter than the long run: 3 days since 2022, against 1.0 a year before that.
2 of the 15 days reached 2 inches or more -- 13%, or about one hail day in 8, the last on 2025-05-19. Those big days do not follow the county's usual calendar: most of them fall in May, not June. Golf-ball size is rarer still: 1.75 inches or more on 3 of the 15 days.
Across the whole of Iowa, see the Iowa hail map and history.
Reports cluster nearest Leon -- 4 of the county's 15 hail days -- then Davis City (4), Lamoni (2), Garden Grove (2) and Weldon (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Leon | 2 | 1.75″ |
| Weldon | 2 | 1.25″ |
| 5 Ene Davis City | 2 | 1.00″ |
| 2 S Lamoni | 1 | 2.50″ |
| 1 S Lamoni | 1 | 2.00″ |
The season runs April through June: 15 of the 15 hail days on record fall in those 3 months (100%). June is the single busiest month, with 7 of them (47%). That peak closes the window: the season builds all the way to its worst month and then stops. Reports span 3 of the 12 calendar months; the other 9 have never produced one.
| Month | Hail days |
|---|---|
| April | 4 |
| May | 4 |
| June | 7 |
That day put 1 report on the map, the biggest 2 inches near Grand River. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2025-05-19 | 2.00″ | 1 |
| 2024-05-23 | 1.75″ | 1 |
| 2024-04-30 | 1.00″ | 1 |
| 2021-06-20 | 1.50″ | 1 |
| 2019-06-25 | 1.25″ | 3 |
| 2019-06-24 | 1.25″ | 1 |
| 2018-05-14 | 1.00″ | 1 |
| 2015-06-21 | 1.00″ | 1 |
The colored swath is NOAA's MRMS radar estimate of the largest hail per ~1 km cell; the dots are SPC ground reports. Yellow is about an inch, red 1.5 to 2″, purple 2″ and up (hail size vs roof damage). On this county's worst day the reports reached 2.5 inches, which is the purple band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Wayne County (15 hail days), Clarke County (33) and Ringgold County (21). Decatur County sits in between.
Wayne County · Clarke County · Ringgold County
Back to the Iowa hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Decatur County, Iowa only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.