◆ JANESVILLE AIRPORT, WI HAIL HISTORY · ROCK COUNTY
Janesville Airport, WI hail history & hail map
Janesville Airport, Wisconsin has had 8 hail events in the past 5 years, with hail up to 1.50″ (Ping Pong 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
8Hail events in the past 5 years
1.50″Largest recorded hail · Ping Pong Ball
1.50″Largest ground report (within 3 mi)
1.00″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Janesville Airport, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Janesville Airport
| Date | Peak hail | Sources |
|---|---|---|
| Apr 17, 2026 | 1.50″ Ping Pong Ball | Radar 1.00″ · 1 ground report (max 1.50″) |
| Apr 2, 2026 | 1.25″ Half Dollar | 1 ground report (max 1.25″) |
| Aug 16, 2025 | 1.50″ Ping Pong Ball | Radar 1.00″ · 2 ground reports (max 1.50″) |
| Jun 26, 2024 | 1.00″ Quarter | 2 ground reports (max 1.00″) |
| May 7, 2024 | 0.75″ Penny | 2 ground reports (max 0.75″) |
| Feb 9, 2024 | 0.75″ Penny | 1 ground report (max 0.75″) |
| Sep 20, 2022 | 0.88″ Nickel | 1 ground report (max 0.88″) |
| Feb 22, 2022 | 0.25″ Small | 1 ground report (max 0.25″) |
More Wisconsin hail history
All Wisconsin cities & hail days →
Events count days with NOAA MRMS radar hail over Janesville Airport (42.650, -89.040) 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.