Hail HistoryHome › Illinois › Mercer County
Hail history for Mercer County, IL
46 hail reports in Mercer County since 2006 on 28 days. The largest stones measured 1.75 in (golf ball) on Aug 17, 2023.
Cities in Mercer County
Recent hail in Mercer County
| Date | Hail size | Where |
|---|---|---|
| Mar 10, 2026 | 1.25 in half dollar | Seaton 1 hail report |
| Mar 28, 2025 | 1 in quarter | Viola 1 hail report |
One row per day: the largest hail reported in the county that day, the places and the number of reports.
Hail days in Mercer County by year
When hail season peaks in Mercer County
Damaging thunderstorm winds in Mercer County
65 reports of damaging thunderstorm wind in Mercer County since 2006, on 47 days. The strongest measured gust was 60 mph on Mar 5, 2022.
| Date | Strongest gust | Where |
|---|---|---|
| Jul 20, 2026 | 57 mph, measured | Aledo 1 wind report |
| Jun 17, 2026 | 60 mph, estimated | New Windsor 1 wind report |
| Apr 17, 2026 | 60 mph, estimated | New Boston 1 wind report |
| Aug 18, 2025 | 70 mph, estimated | Aledo 1 wind report |
| May 20, 2025 | 58 mph, estimated | Sherrard 1 wind report |
| Aug 27, 2024 | 60 mph, estimated | Keithsburg 1 wind report |
| Jul 15, 2024 | 70 mph, estimated | New Boston 1 wind report |
| Jul 2, 2024 | 58 mph, estimated | Sherrard 1 wind report |
| Jun 16, 2024 | 60 mph, estimated | Preemption 1 wind report |
| Jun 13, 2024 | 60 mph, estimated | Keithsburg, Griffin 2 wind reports |
Severe thunderstorm wind means gusts of 58 mph or more, or wind that caused damage. Measured gusts come from weather stations; estimated ones from spotters and damage surveys.
Filing a roof or car hail claim?
Insurers ask for the date of loss. The dates on this page are when hail was reported near Mercer County; hail can hit one street and miss the next, so a report is not proof of damage at your address. A licensed roofer or your insurance adjuster can inspect the roof. Many policies set a time limit for filing a claim — check yours.
Data: NOAA NCEI Storm Events Database (final records through Jun 30, 2026) and National Weather Service Local Storm Reports (preliminary, since then).