The most recent reported hail day was 2026-04-02, 120 days ago. Whiteside County is hit in most years. The largest stone on record here is 2 inches, a hen egg and twice the National Weather Service's 1 inch severe criterion, reported on 2017-02-28 near Sterling.
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 2026-04-02, around Whiteside County A. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Whiteside 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 26 separate hail days here since 2010 -- 1.5 a year over 17 years of record. They carry 39 reports in total: most hail days here are logged from a single spot. 5 of those 17 years produced none at all. The busiest single year was 2011, with 5 hail days. The last five years have run hotter than the long-run rate: 10 days since 2022, against 1.3 a year before that.
Most hail here stays under 2 inches: only 1 of the 26 days on record passed it, 4%, the last on 2017-02-28. Those big days do not follow the county's usual calendar: most of them fall in February, not May. 7 of the 26 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 Morrison -- 4 of the county's 26 hail days -- then Rock Falls (3), Sterling (2), Prophetstown (2) and Tampico (2). Beyond those, NOAA names Erie and Fulton on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| Morrison | 2 | 1.75″ |
| Erie | 2 | 1.00″ |
| Fulton | 2 | 1.00″ |
| Sterling | 1 | 2.00″ |
| 1 W Penrose | 1 | 1.75″ |
The season runs March through August: 21 of the 26 hail days on record fall in those 6 months (81%). May is the single busiest month, with 7 of them (27%). That peak sits inside the window rather than at either end. Hail has also been reported in February, 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 | 2 |
| March | 4 |
| April | 5 |
| May | 7 |
| June | 2 |
| August | 3 |
| September | 2 |
| November | 1 |
That day put 1 report on the map, the biggest 1.5 inches near Whiteside County A. 2 hail days have already been reported this year.
| Date | Max hail | Reports |
|---|---|---|
| 2026-04-02 | 1.50″ | 1 |
| 2026-03-10 | 1.00″ | 2 |
| 2025-05-15 | 1.75″ | 1 |
| 2024-08-05 | 1.75″ | 2 |
| 2024-05-07 | 1.00″ | 2 |
| 2024-03-04 | 1.00″ | 1 |
| 2024-02-27 | 1.00″ | 2 |
| 2023-04-04 | 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 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: Lee County (18 hail days), Henry County (37), Bureau County (30) and Clinton County, Iowa (23). Whiteside County sits in between.
Lee County · Henry County · Bureau County · Clinton County, Iowa
Back to the Illinois hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Whiteside County, Illinois only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.