The most recent reported hail day was 2026-04-27, 95 days ago. St. Charles County is hit in most years, and usually several times over. The largest stone on record here is 4 inches, a grapefruit and 4 times the National Weather Service's 1 inch severe criterion, reported on 2016-05-11 near Cottleville.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Missouri. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-04-27, around O'Fallon. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls St. Charles County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
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See call-center options ->NOAA's Storm Prediction Center has logged 55 separate hail days here since 2010 -- 3.2 a year over 17 years of record. Those days carry 349 separate reports between them, better than three on a typical one. Exactly one year since 2010 passed with no reported hail day at all. The busiest single year was 2012, with 8 hail days. The last five years track the long-run rate, with 16 days since 2022.
9 of the 55 days reached 2 inches or more -- 16%, or about one hail day in 6, the last on 2025-05-16. Those big days do not follow the county's usual calendar: most of them fall in May, not April. 15 of the 55 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Missouri, see the Missouri hail map and history.
Reports cluster nearest O'Fallon -- 14 of the county's 55 hail days -- then Wentzville (13), Weldon Spring (12), Harvester (10) and Saint Charles (9). Beyond those, NOAA names St. Charles, St. Peters, Dardenne Prairie, Cottleville, Flint Hill, New Melle, Saint Peters, Lake St. Louis and Foristell on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| St. Charles | 9 | 2.75″ |
| St. Peters | 9 | 2.50″ |
| Wentzville | 8 | 3.00″ |
| O'Fallon | 8 | 2.75″ |
| Cottleville | 6 | 2.00″ |
The season runs March through June: 44 of the 55 hail days on record fall in those 4 months (80%). April is the single busiest month, with 17 of them (31%). That peak sits inside the window rather than at either end. February, October and December are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| January | 1 |
| March | 9 |
| April | 17 |
| May | 10 |
| June | 8 |
| July | 5 |
| August | 1 |
| September | 3 |
| November | 1 |
That day put 7 reports on the map, the biggest 1.25 inches near O'Fallon. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-27 | 1.25″ | 7 |
| 2026-04-17 | 1.00″ | 12 |
| 2025-05-16 | 2.50″ | 29 |
| 2025-04-30 | 1.00″ | 2 |
| 2025-04-10 | 1.00″ | 2 |
| 2025-03-30 | 1.00″ | 1 |
| 2025-03-14 | 1.25″ | 1 |
| 2024-07-30 | 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 4 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: St. Louis County (67 hail days), Lincoln County (23) and Warren County (28). St. Charles County sits in between.
St. Louis County · Lincoln County · Warren County
Back to the Missouri hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, St. Charles County, Missouri only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.