◆ HARLEM, IL HAIL HISTORY · WINNEBAGO COUNTY
Harlem, IL hail history & hail map
Harlem, Illinois has had 6 hail events in the past 5 years, with hail up to 2.00″ (Golf Ball). Most recent: Aug 21, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
6Hail events in the past 5 years
2.00″Largest recorded hail · Golf Ball
2.00″Largest ground report (within 3 mi)
1.25″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Harlem, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Harlem
| Date | Peak hail | Sources |
|---|---|---|
| Aug 21, 2026 | 1.00″ Quarter | 2 ground reports (max 1.00″) |
| Aug 16, 2025 | 0.75″ Penny | Radar 0.75″ |
| Jul 10, 2025 | 1.50″ Ping Pong Ball | Radar 1.25″ · 4 ground reports (max 1.50″) |
| Jul 26, 2023 | 0.75″ Penny | Radar 0.75″ |
| Jun 29, 2023 | 2.00″ Golf Ball | 4 ground reports (max 2.00″) |
| Apr 20, 2023 | 1.00″ Quarter | 2 ground reports (max 1.00″) |
More Illinois hail history
All Illinois cities & hail days →
Events count days with NOAA MRMS radar hail over Harlem (42.340, -89.010) 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.