◆ ROCK GROVE, IL HAIL HISTORY · STEPHENSON COUNTY
Rock Grove, IL hail history & hail map
Rock Grove, Illinois has had 3 hail events in the past 5 years, with hail up to 1.75″ (Golf Ball). Most recent: Apr 17, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
3Hail events in the past 5 years
1.75″Largest recorded hail · Golf Ball
1.75″Largest ground report (within 3 mi)
1.25″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Rock Grove, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Rock Grove
| Date | Peak hail | Sources |
|---|---|---|
| Apr 17, 2026 | 1.75″ Golf Ball | Radar 1.25″ · 2 ground reports (max 1.75″) |
| Aug 17, 2023 | 1.00″ Quarter | Radar 1.00″ |
| May 13, 2022 | 1.00″ Quarter | 1 ground report (max 1.00″) |
More Illinois hail history
All Illinois cities & hail days →
Events count days with NOAA MRMS radar hail over Rock Grove (42.460, -89.480) or an NWS / CoCoRaHS hail report within 3 miles. Data window: NOAA MRMS radar hail swaths Oct 2021 – Nov 2026; NWS / NCEI Storm Events reports Nov 2024 – Jul 2026; CoCoRaHS volunteer reports Oct 2021 – present. Radar hail sizes are estimates, not ground truth; hail at any single address can differ.