Clinton County, Illinois Hail Map & History
Clinton County was hit as recently as 2026-08-21, 24 days ago. Clinton County is hit in about half the years on record. 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 2012-09-25 near New Baden.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Illinois. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-08-21, around Aviston. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Clinton 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 ->How often it hails in Clinton County
NOAA's Storm Prediction Center has logged 16 separate hail days here since 2010 -- 0.9 a year over 17 years of record. Those days carry 44 separate reports between them, two or three on a typical one. 8 of those 17 years produced none at all. One year dominates the record: 2012 alone produced 6 of the 16 days. The last five years track the long-run rate, with 5 days since 2022.
Roof-killing hail is routine here: 5 of the 16 days reached 2 inches or more, 31% of them, the last on 2026-08-21. Those big days do not follow the county's usual calendar: most of them fall in April, not March. 7 of the 16 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Illinois, see the Illinois hail map and history.
Hardest-hit places in Clinton County
Reports cluster nearest Aviston -- 9 of the county's 16 hail days -- then Carlyle (5), Trenton (4), Breese (3) and New Baden (2). That one town is named on 56% of them. Beyond those, NOAA names Albers on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Aviston | 9 | 2.75″ |
| Carlyle | 3 | 1.50″ |
| New Baden | 2 | 3.00″ |
| Trenton | 2 | 3.00″ |
| 2 S New Baden | 1 | 2.75″ |
When it hails in Clinton County
The season runs March through August: 13 of the 16 hail days on record fall in those 6 months (81%). March is the single busiest month, with 4 of them (25%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in January, September and November, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| January | 1 |
| March | 4 |
| April | 4 |
| May | 1 |
| July | 2 |
| August | 2 |
| September | 1 |
| November | 1 |
Recent Clinton County hail days
That day put 1 report on the map, the biggest 2 inches near Aviston. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-08-21 | 2.00″ | 1 |
| 2025-04-30 | 2.00″ | 3 |
| 2024-04-07 | 1.50″ | 3 |
| 2024-03-14 | 1.00″ | 3 |
| 2023-07-01 | 1.00″ | 2 |
| 2019-08-17 | 1.00″ | 1 |
| 2017-11-05 | 1.75″ | 1 |
| 2017-03-30 | 1.00″ | 1 |
How to read the Clinton County map
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.
Nearby counties
The nearest counties with a page of their own: Washington County (18 hail days), St. Clair County (47) and Madison County (55). Every one of them takes more hail than Clinton County.
Washington County · St. Clair County · Madison County
Back to the Illinois hail map or the U.S. hail map.
FAQ
How often does it hail in Clinton County, Illinois?
When is hail season in Clinton County?
How big does hail get in Clinton County?
When was the last hail in Clinton County?
Is the Clinton County hail map free?
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Clinton County, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.