The most recent reported hail day was 2026-04-27, 95 days ago. Monroe County is hit in most years. The largest stone on record here is 2.75 inches, a baseball and 2.8 times the National Weather Service's 1 inch severe criterion, reported on 2024-03-14 near New Design.
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 2026-04-27, around Columbia. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Monroe 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 24 separate hail days here since 2010 -- 1.4 a year over 17 years of record. Those days carry 62 separate reports between them, two or three on a typical one. 4 of those 17 years produced none at all. The busiest single year was 2024, with 4 hail days. The last five years track the long-run rate, with 9 days since 2022.
3 of the 24 days reached 2 inches or more -- 12%, or about one hail day in 8, the last on 2024-05-08. Those big days do not follow the county's usual calendar: most of them fall in March, not April. 6 of the 24 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 Columbia -- 8 of the county's 24 hail days -- then Valmeyer (6), Maeystown (5), New Handover (4) and Waterloo (4). Beyond those, NOAA names Fults and Hecker on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Valmeyer | 4 | 2.00″ |
| Waterloo | 4 | 1.75″ |
| Fults | 3 | 2.50″ |
| 1 N Columbia | 3 | 1.50″ |
| 2 ESE Columbia | 3 | 1.25″ |
The season runs March through June: 21 of the 24 hail days on record fall in those 4 months (88%). April is the single busiest month, with 9 of them (38%). That peak sits inside the window rather than at either end. Hail has also been reported in February, November and December, outside that window. Reports span 7 of the 12 calendar months; the other 5 have never produced one.
| Month | Hail days |
|---|---|
| February | 1 |
| March | 6 |
| April | 9 |
| May | 3 |
| June | 3 |
| November | 1 |
| December | 1 |
That day put 1 report on the map, the biggest 1 inch near Columbia. 1 hail day has already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-27 | 1.00″ | 1 |
| 2025-03-30 | 1.50″ | 4 |
| 2025-03-14 | 1.50″ | 10 |
| 2024-05-08 | 2.50″ | 2 |
| 2024-04-01 | 1.00″ | 3 |
| 2024-03-14 | 2.75″ | 6 |
| 2024-03-13 | 1.75″ | 5 |
| 2023-04-15 | 1.00″ | 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 2.75 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. Clair County (47 hail days), Randolph County (21), Madison County (54), Jefferson County, Missouri (53) and St. Louis City, Missouri (26). Monroe County sits in between.
St. Clair County · Randolph County · Madison County · Jefferson County, Missouri · St. Louis City, Missouri
Back to the Illinois hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Monroe County, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.