◆ OCONOMOWOC, WI HAIL HISTORY · WAUKESHA COUNTY
Oconomowoc, WI hail history & hail map
Oconomowoc, Wisconsin has had 12 hail events in the past 5 years, with hail up to 2.50″ (Tennis Ball). Most recent: Jul 27, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
12Hail events in the past 5 years
2.50″Largest recorded hail · Tennis Ball
2.50″Largest ground report (within 3 mi)
2.25″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Oconomowoc, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Oconomowoc
| Date | Peak hail | Sources |
|---|---|---|
| Jul 27, 2026 | 2.50″ Tennis Ball | Radar 1.00″ · 4 ground reports (max 2.50″) |
| Apr 21, 2026 | 0.25″ Small | 1 ground report (max 0.25″) |
| Apr 14, 2026 | 1.00″ Quarter | 1 ground report (max 1.00″) |
| May 15, 2025 | 1.00″ Quarter | Radar 1.00″ · 1 ground report (max 1.00″) |
| Apr 18, 2025 | 1.00″ Quarter | 1 ground report (max 1.00″) |
| Feb 9, 2024 | 1.50″ Ping Pong Ball | 3 ground reports (max 1.50″) |
| Feb 8, 2024 | 0.75″ Penny | 1 ground report (max 0.75″) |
| May 31, 2023 | 0.88″ Nickel | 1 ground report (max 0.88″) |
| Sep 20, 2022 | 0.88″ Nickel | 2 ground reports (max 0.88″) |
| Jun 13, 2022 | 1.75″ Golf Ball | Radar 1.00″ · 2 ground reports (max 1.75″) |
| Jun 10, 2022 | 2.25″ Golf Ball | Radar 2.25″ · 9 ground reports (max 1.75″) |
| May 26, 2022 | 0.75″ Penny | Radar 0.75″ |
More Wisconsin hail history
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Events count days with NOAA MRMS radar hail over Oconomowoc (43.110, -88.510) 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.