Clark County, Illinois Hail Map & History
Clark County was hit as recently as 2026-08-11, 34 days ago. Clark 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 2025-11-18 near Bellair.
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 2026-08-11, around Martinsville. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Clark 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 ->How often it hails in Clark County
NOAA's Storm Prediction Center has logged 17 separate hail days here since 2010 -- 1.0 a year over 17 years of record. They carry 24 reports in total: most hail days here are logged from a single spot. 7 of those 17 years produced none at all. The busiest single year was 2026, with 3 hail days. The last five years track the long-run rate, with 6 days since 2022.
Most hail here stays under 2 inches: only 1 of the 17 days on record passed it, 6%, the last on 2025-11-18. Those big days do not follow the county's usual calendar: most of them fall in November, not May. 5 of the 17 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 Clark County
Reports cluster nearest Marshall -- 6 of the county's 17 hail days -- then Martinsville (6), Westfield (3), Casey (3) and Clarksville (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Martinsville | 4 | 1.00″ |
| Westfield | 3 | 1.75″ |
| 4 NNE Bellair | 1 | 2.50″ |
| 2 S Oliver | 1 | 1.75″ |
| 2 Sw Marshall | 1 | 1.75″ |
When it hails in Clark County
Clark County has no tight season -- it takes 7 months (February through August) to account for 82% of the 17 days on record. May is the single busiest month, with 5 of them (29%). That peak sits inside the window rather than at either end. Hail has also been reported in September and November, outside that window. Reports span 8 of the 12 calendar months; the other 4 have never produced one.
| Month | Hail days |
|---|---|
| February | 1 |
| March | 4 |
| April | 2 |
| May | 5 |
| June | 1 |
| August | 1 |
| September | 1 |
| November | 2 |
Recent Clark County hail days
That day put 1 report on the map, the biggest 1 inch near Martinsville. 3 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-08-11 | 1.00″ | 1 |
| 2026-03-22 | 1.00″ | 3 |
| 2026-02-19 | 1.00″ | 2 |
| 2025-11-18 | 2.50″ | 1 |
| 2024-03-13 | 1.25″ | 1 |
| 2022-05-26 | 1.00″ | 1 |
| 2019-05-27 | 1.75″ | 1 |
| 2018-05-15 | 1.00″ | 1 |
How to read the Clark 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 2.5 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, over the state line included: Edgar County (15 hail days), Coles County (22), Douglas County (13) and Vigo County, Indiana (21). Clark County sits in between.
Edgar County · Coles County · Douglas County · Vigo County, Indiana
Back to the Illinois hail map or the U.S. hail map.
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Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Clark County, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.