The most recent reported hail day was 2026-04-27, 95 days ago. Jefferson County is hit in most years, and usually several times over. The largest stone on record here is 3 inches, a teacup and 3 times the National Weather Service's 1 inch severe criterion, reported on 2017-11-05 near Festus.
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 Dittmer. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Jefferson 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 53 separate hail days here since 2010 -- 3.1 a year over 17 years of record. Those days carry 208 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 2024, with 8 hail days. The last five years track the long-run rate, with 19 days since 2022.
9 of the 53 days reached 2 inches or more -- 17%, or about one hail day in 6, the last on 2024-05-08. Those big days do not follow the county's usual calendar: most of them fall in May, not April. 16 of the 53 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 Festus -- 14 of the county's 53 hail days -- then Hillsboro (11), Arnold (10), Crystal City (9) and Herculaneum (8). Beyond those, NOAA names Cedar Hill, Hematite, De Soto, Pevely, Olympian Village, Dittmer, House Springs, Barnhart and Imperial on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Festus | 8 | 2.50″ |
| Hillsboro | 6 | 2.75″ |
| Arnold | 5 | 2.50″ |
| Crystal City | 5 | 2.50″ |
| Herculaneum | 5 | 1.75″ |
The season runs February through July: 44 of the 53 hail days on record fall in those 6 months (83%). April is the single busiest month, with 14 of them (26%). That peak sits inside the window rather than at either end. January are the only months that have never produced a reported hail day.
| Month | Hail days |
|---|---|
| February | 2 |
| March | 7 |
| April | 14 |
| May | 10 |
| June | 6 |
| July | 5 |
| August | 1 |
| September | 3 |
| October | 2 |
| November | 2 |
| December | 1 |
That day put 1 report on the map, the biggest 1 inch near Dittmer. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-27 | 1.00″ | 1 |
| 2025-06-07 | 1.00″ | 1 |
| 2025-03-14 | 1.75″ | 21 |
| 2024-07-08 | 1.50″ | 2 |
| 2024-05-26 | 1.75″ | 2 |
| 2024-05-24 | 1.00″ | 1 |
| 2024-05-21 | 1.00″ | 1 |
| 2024-05-08 | 2.75″ | 24 |
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 3 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, over the state line included: St. Louis County (67 hail days), St. Louis City (26), Washington County (29) and Monroe County, Illinois (24). Jefferson County sits in between.
St. Louis County · St. Louis City · Washington County · Monroe County, Illinois
Back to the Missouri hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Jefferson County, Missouri only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.