The most recent reported hail day was 2024-08-15 -- 1 year ago, with nothing reported since. Warren County is hit in most years. 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 2024-05-24 near Roseville.
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 2024-08-15, around Roseville. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Warren 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 21 separate hail days here since 2010 -- 1.2 a year over 17 years of record. They carry 28 reports in total: most hail days here are logged from a single spot. 6 of those 17 years produced none at all. The busiest single year was 2022, with 3 hail days. The last five years track the long-run rate, with 5 days since 2022.
No stone of 2 inches or more has ever been reported in Warren County: all 21 hail days on record topped out below that. 8 of the 21 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of Illinois, see the Illinois hail map and history.
Reports cluster nearest Monmouth -- 5 of the county's 21 hail days -- then Roseville (5), Cameron (3), Kirkwood (2) and Monmouth Municipal (2).
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Monmouth | 4 | 1.75″ |
| Roseville | 3 | 1.00″ |
| 1 W Roseville | 2 | 1.75″ |
| 5 Ssw Kirkwood | 2 | 1.75″ |
| Cameron | 2 | 1.25″ |
The season runs March through June: 17 of the 21 hail days on record fall in those 4 months (81%). May is the single busiest month, with 8 of them (38%). That peak sits inside the window rather than at either end. Hail has also been reported in August, September and October, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| March | 3 |
| April | 3 |
| May | 8 |
| June | 3 |
| August | 2 |
| September | 1 |
| October | 1 |
That day put 1 report on the map, the biggest 1 inch near Roseville. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2024-08-15 | 1.00″ | 1 |
| 2024-05-24 | 1.75″ | 2 |
| 2022-06-12 | 1.00″ | 1 |
| 2022-05-26 | 1.00″ | 1 |
| 2022-05-13 | 1.00″ | 1 |
| 2020-05-14 | 1.00″ | 1 |
| 2020-04-08 | 1.75″ | 1 |
| 2020-04-07 | 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: Knox County (25 hail days), McDonough County (26) and Mercer County (13). Warren County sits in between.
Knox County · McDonough County · Mercer County
Back to the Illinois hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Warren County, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.