St. Clair County was hit as recently as 2026-06-25, 36 days ago. St. Clair County is hit in about half the years on record. The largest stone on record here is 1.75 inches, a golf ball and 1.8 times the National Weather Service's 1 inch severe criterion, reported on 2026-06-25 near Capac.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in Michigan. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2026-06-25, around Capac. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls St. Clair 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 13 separate hail days here since 2010 -- 0.8 a year over 17 years of record. They carry 17 reports in total: most hail days here are logged from a single spot. 8 of those 17 years produced none at all. The busiest single year was 2026, with 2 hail days. The last five years have run hotter than the long-run rate: 5 days since 2022, against 0.7 a year before that.
No stone of 2 inches or more has ever been reported in St. Clair County: all 13 hail days on record topped out below that. 4 of the 13 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Michigan, see the Michigan hail map and history.
Reports cluster nearest Marysville -- 2 of the county's 13 hail days -- then St. Clair (2) and Port Huron (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Algonac | 1 | 1.75″ |
| Capac | 1 | 1.75″ |
| Emmett | 1 | 1.75″ |
| Marysville | 1 | 1.75″ |
| St. Clair | 1 | 1.75″ |
The season runs April through August: 11 of the 13 hail days on record fall in those 5 months (85%). July is the single busiest month, with 4 of them (31%). That peak sits inside the window rather than at either end. Hail has also been reported in February and September, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| February | 1 |
| April | 2 |
| May | 1 |
| June | 1 |
| July | 4 |
| August | 3 |
| September | 1 |
That day put 3 reports on the map, the biggest 1.75 inches near Capac. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-06-25 | 1.75″ | 3 |
| 2026-02-18 | 1.25″ | 1 |
| 2024-08-30 | 1.50″ | 1 |
| 2023-07-20 | 1.75″ | 1 |
| 2023-07-14 | 1.00″ | 1 |
| 2020-08-15 | 1.00″ | 1 |
| 2020-04-07 | 1.00″ | 3 |
| 2019-09-11 | 1.25″ | 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 1.75 inches, which is the red band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own: Macomb County (24 hail days), Oakland County (28) and Genesee County (15). Every one of them takes more hail than St. Clair County.
Macomb County · Oakland County · Genesee County
Back to the Michigan hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, St. Clair County, Michigan only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.