Hail history for Walworth County, Wisconsin
Every NOAA hail report filed in Walworth County since 1967, with preliminary National Weather Service reports to November 3, 2026.
Readout · Walworth County
- Last hail
- Aug 9, 2026
- 1.50 in, ping pong ball size · preliminary
- Hail days, last 5 years
- 9
- since Nov 3, 2021 · 19 reports
- Largest ever
- 2.50 in
- tennis ball · May 2, 2018
139 reports on 76 days since 1967 · #27 of 73 Wisconsin counties
Hail map · Walworth County
- 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 Walworth County
The latest hail report in Walworth County is from August 9, 2026, 1.50 in (ping pong ball size). Since November 3, 2021 there have been 9 separate hail days; the biggest stones in that time were 2.00 in on April 2, 2026.
Over the 20 years 2006–2025, Walworth County logged 82 reports on 38 hail days, about 4.1 reports a year. That is 17% more than the median Wisconsin county (3.5 a year) and ranks #27 of 73 Wisconsin counties for all-time reports. Walworth County holds 1% of all 9,358 hail reports in Wisconsin.
4% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Wisconsin county. The largest hail on record here is 2.50 in (tennis ball) on May 2, 2018 near 1.68 WSW Williams Bay.
Reports were up 28% in 2016–2025 (46) compared with 2006–2015 (36). The busiest year was 2000, with 12 reports on 5 days. Hail here peaks in May (25% of reports); 47% fall between April and June.
Reports a year 2006–2025 average
- Walworth County 4.1
- Median Wisconsin county 3.5
Hail days 2006–2025
- Walworth County 38
- Median Wisconsin county 37
Share 2 in or larger of sized reports
- Walworth County 4%
- Median Wisconsin county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 4 | 4 | 8 | ||||||||||
| 2025 | 6 | 6 | |||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 1 | 1 | 2 | ||||||||||
| 2022 | 2 | 2 | |||||||||||
| 2021 | 8 | 8 | |||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 4 | 4 | |||||||||||
| 2018 | 10 | 10 | |||||||||||
| 2017 | 1 | 1 | 9 | 11 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Aug 9, 2026 | 4 | 1.50 in | View |
| Apr 17, 2026 | 1 | 1.00 in | — |
| Apr 15, 2026 | 1 | 1.00 in | — |
| Apr 2, 2026 | 2 | 2.00 in | — |
| May 15, 2025 | 6 | 2.00 in | — |
| Feb 27, 2024 | 1 | 0.88 in | — |
| May 31, 2023 | 1 | 0.88 in | — |
| Apr 4, 2023 | 1 | 1.00 in | — |
| Jul 23, 2022 | 2 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| May 2, 2018 | 2.50 intennis ball | 1.68 WSW Williams Bay | $1K | 19:58 local · NCEI |
| Jul 20, 1980 | 2.50 intennis ball | — | — | 18:15 local · NCEI |
| Apr 2, 2026 | 2.00 inhen egg | 2.14 WNW Whitewater | — | 17:41 local · NCEI |
| May 15, 2025 | 2.00 inhen egg | 0.69 N East Troy | — | 17:08 local · NCEI |
| Apr 19, 2000 | 2.00 inhen egg | Darien | — | 23:43 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 50 36%
- 1–2 in 83 60%
- 2 in + 6 4%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Aug 9, 2026 | 1.50 inping pong ball | 2 W Pell Lake | 04:11 UTC · NWS prelim. |
| Aug 9, 2026 | 1.00 inquarter | 1 SSW Lake Geneva | 04:03 UTC · NWS prelim. |
| Aug 9, 2026 | 1.25 inhalf dollar | 3 SW Lake Geneva | 04:00 UTC · NWS prelim. |
| Aug 9, 2026 | 1.00 inquarter | 3 SSE Fontana-on-Geneva | 03:50 UTC · NWS prelim. |
| Apr 17, 2026 | 1.00 inquarter | 1.52 W Little Prairie | 18:02 local · NCEI |
| Apr 15, 2026 | 1.00 inquarter | 1.02 E Elkhorn Arpt | 19:34 local · NCEI |
| Apr 2, 2026 | 1.00 inquarter | 1.51 W Whitewater | 17:47 local · NCEI |
| Apr 2, 2026 | 2.00 inhen egg | 2.14 WNW Whitewater | 17:41 local · NCEI |
| May 15, 2025 | 2.00 inhen egg | 0.69 N East Troy | 17:08 local · NCEI |
| May 15, 2025 | 1.00 inquarter | 0.51 W East Troy | 17:06 local · NCEI |
| May 15, 2025 | 1.25 inhalf dollar | 0.69 N East Troy | 17:03 local · NCEI |
| May 15, 2025 | 1.50 inping pong ball | 3.45 N Spring Prairie | 17:00 local · NCEI |
Cities and towns in Walworth County
| Place | Reports | Largest |
|---|---|---|
| Bloomfield | 20 | 1.75 in |
| Whitewater | 17 | 2.00 in |
| East Troy | 14 | 2.00 in |
| Delavan | 13 | 2.50 in |
| Elkhorn | 10 | 1.50 in |
| Lake Geneva | 10 | 2.00 in |
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Genoa City | 8 | 6 | May 2, 2018 |
| Como | 6 | 5 | Sep 7, 2021 |
| Lauderdale Lakes | 6 | 6 | Apr 17, 2026 |
| Williams Bay | 6 | 4 | Sep 7, 2021 |
| Darien | 5 | 4 | May 2, 2018 |
| Lake Lorraine | 4 | 3 | May 22, 2011 |
| Lyons | 4 | 4 | Jun 1, 2019 |
| Fontana-on-Geneva Lake | 3 | 3 | Aug 9, 2026 |
| Sharon | 3 | 3 | May 21, 1987 |
| Walworth | 3 | 3 | Sep 7, 2021 |
| Turtle Lake | 2 | 2 | Aug 30, 2013 |
| Allens Grove | 1 | 1 | Sep 21, 2010 |
| Potter Lake | 1 | 1 | Jul 6, 2017 |
| Springfield | 1 | 1 | May 17, 2006 |
Questions about hail in Walworth County
How often does it hail in Walworth County, Wisconsin?
139 hail reports have been logged in Walworth County since 1967. Over the 20 years 2006–2025 that averages 4.1 reports a year. That ranks #27 of 73 Wisconsin counties by number of reports.
When is hail season in Walworth County?
Most reports come in May, July, June. May alone accounts for 25% of all reports.
What is the largest hail recorded in Walworth County?
2.50 in (tennis ball size) on May 2, 2018 near 1.68 WSW Williams Bay. 4% of reports here were 2 inches or larger.
When did it last hail in Walworth County?
The most recent report in this data is from August 9, 2026 (1.50 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Walworth County had in the last five years?
9 separate days with hail reports since November 3, 2021, adding up to 19 reports. The most recent was August 9, 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.