Hail history for Oconomowoc, Wisconsin
NOAA hail reports in and within about 5 km (3 miles) of Oconomowoc since 1973, with preliminary reports to November 3, 2026.
Readout · Oconomowoc
- Last hail
- Jul 27, 2026
- 2.50 in, tennis ball size
- Hail days, last 5 years
- 8
- since Nov 3, 2021 · 19 reports
- Largest ever
- 2.50 in
- tennis ball · Jul 27, 2026
38 reports on 25 days since 1973 · #15 of 271 Wisconsin places
Hail map · Oconomowoc
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
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What the record says about Oconomowoc
The latest hail report in and around Oconomowoc is from July 27, 2026, 2.50 in (tennis ball size). Since November 3, 2021 there have been 8 separate hail days; the biggest stones in that time were 2.50 in on July 27, 2026.
Over the 20 years 2006–2025, Oconomowoc logged 27 reports on 16 hail days, about 1.4 reports a year. That is 3.0 times the median Wisconsin town on this site (0.5 a year) and ranks #15 of 271 Wisconsin cities and towns on this site for all-time reports. Oconomowoc accounts for 14% of the 265 reports filed in Waukesha County.
5% of reports with a size were 2 inches (hen egg) or larger, against 6% for the median Wisconsin town on this site. The largest hail on record here is 2.50 in (tennis ball) on July 27, 2026 near 1.66 WSW Oconomowoc.
Reports were up 100% in 2016–2025 (18) compared with 2006–2015 (9). The busiest year was 2022, with 10 reports on 3 days. Hail here peaks in June (32% of reports); 61% fall between April and June.
Reports a year 2006–2025 average
- Oconomowoc 1.4
- Waukesha County 8.9
- Median Wisconsin town on this site 0.5
Hail days 2006–2025
- Oconomowoc 16
- Waukesha County 67
- Median Wisconsin town on this site 7
Share 2 in or larger of sized reports
- Oconomowoc 5%
- Waukesha County 6%
- Median Wisconsin town on this site 6%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 3 | 4 | ||||||||||
| 2025 | 1 | 1 | |||||||||||
| 2024 | 3 | 3 | |||||||||||
| 2023 | 1 | 1 | |||||||||||
| 2022 | 9 | 1 | 10 | ||||||||||
| 2021 | 1 | 1 | |||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 1 | 1 | |||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 27, 2026 | 3 | 2.50 in | — |
| Apr 14, 2026 | 1 | 1.00 in | — |
| May 15, 2025 | 1 | 1.00 in | — |
| Feb 8, 2024 | 3 | 1.50 in | — |
| May 31, 2023 | 1 | 0.88 in | — |
| Sep 20, 2022 | 1 | 0.88 in | — |
| Jun 13, 2022 | 2 | 1.75 in | — |
| Jun 10, 2022 | 7 | 1.75 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 27, 2026 | 2.50 intennis ball | 1.66 WSW Oconomowoc | Waukesha | 10:21 local · NCEI |
| Jul 27, 2026 | 2.00 inhen egg | 0.86 SW Oconomowoc | Waukesha | 10:17 local · NCEI |
| Jun 13, 2022 | 1.75 ingolf ball | 2.05 NW Oconomowoc Lake | Waukesha | 14:56 local · NCEI |
| Jun 10, 2022 | 1.75 ingolf ball | 1.22 SW Oconomowoc | Waukesha | 17:07 local · NCEI |
| Jun 10, 2022 | 1.75 ingolf ball | 1.22 SW Oconomowoc | Waukesha | 16:53 local · NCEI |
Size of every report
- Under 1 in 14 37%
- 1–2 in 22 58%
- 2 in + 2 5%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 27, 2026 | 2.50 intennis ball | 1.66 WSW Oconomowoc | Waukesha | 10:21 local · NCEI |
| Jul 27, 2026 | 2.00 inhen egg | 0.86 SW Oconomowoc | Waukesha | 10:17 local · NCEI |
| Jul 27, 2026 | 1.25 inhalf dollar | 1.47 SSE Ixonia Arpt | Jefferson | 10:11 local · NCEI |
| Apr 14, 2026 | 1.00 inquarter | 2.05 NW Oconomowoc Lake | Waukesha | 17:04 local · NCEI |
| May 15, 2025 | 1.00 inquarter | 1.47 SSW Lac La Belle | Waukesha | 17:15 local · NCEI |
| Feb 8, 2024 | 1.00 inquarter | 1.47 SSW Oconomowoc | Waukesha | 18:56 local · NCEI |
| Feb 8, 2024 | 1.50 inping pong ball | 0.86 NW Summit Corners | Waukesha | 18:50 local · NCEI |
| Feb 8, 2024 | 1.00 inquarter | 1.47 SSW Oconomowoc | Waukesha | 18:49 local · NCEI |
| May 31, 2023 | 0.88 innickel | 0.86 NE Oconomowoc | Waukesha | 12:49 local · NCEI |
| Sep 20, 2022 | 0.88 innickel | 1.66 WSW Oconomowoc | Waukesha | 13:42 local · NCEI |
| Jun 13, 2022 | 1.75 ingolf ball | 2.05 NW Oconomowoc Lake | Waukesha | 14:56 local · NCEI |
| Jun 13, 2022 | 1.25 inhalf dollar | 2.13 WNW Oconomowoc Lake | Waukesha | 14:55 local · NCEI |
Hail history near Oconomowoc
Questions about hail in Oconomowoc
How often does it hail in Oconomowoc, Wisconsin?
38 hail reports have been logged in and within about 5 km (3 miles) of Oconomowoc since 1973. Over the 20 years 2006–2025 that averages 1.4 reports a year. That ranks #15 of 271 Wisconsin places by number of reports.
When is hail season in Oconomowoc?
Most reports come in June, May, September. June alone accounts for 32% of all reports.
What is the largest hail recorded in Oconomowoc?
2.50 in (tennis ball size) on July 27, 2026 near 1.66 WSW Oconomowoc. 5% of reports here were 2 inches or larger.
When did it last hail in Oconomowoc?
The most recent report in this data is from July 27, 2026 (2.50 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Oconomowoc had in the last five years?
8 separate days with hail reports since November 3, 2021, adding up to 19 reports. The most recent was July 27, 2026.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.