Hail history for Jefferson County, Wisconsin
Every NOAA hail report filed in Jefferson County since 1956, with preliminary National Weather Service reports to November 3, 2026.
Readout · Jefferson County
- Last hail
- Jul 27, 2026
- 1.25 in, half dollar size
- Hail days, last 5 years
- 11
- since Nov 3, 2021 · 39 reports
- Largest ever
- 4.25 in
- grapefruit · May 11, 2011
177 reports on 95 days since 1956 · #12 of 73 Wisconsin counties
Hail map · Jefferson 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 Jefferson County
The latest hail report in Jefferson County is from July 27, 2026, 1.25 in (half dollar size). Since November 3, 2021 there have been 11 separate hail days; the biggest stones in that time were 2.75 in on April 14, 2026.
Over the 20 years 2006–2025, Jefferson County logged 100 reports on 46 hail days, about 5.0 reports a year. That is 43% more than the median Wisconsin county (3.5 a year) and ranks #12 of 73 Wisconsin counties for all-time reports. Jefferson County holds 2% of all 9,358 hail reports in Wisconsin.
10% 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 4.25 in (grapefruit) on May 11, 2011 near 4 W Jefferson.
Reports were down 25% in 2016–2025 (43) compared with 2006–2015 (57). The busiest year was 2025, with 15 reports on 2 days. Hail here peaks in May (25% of reports); 66% fall between April and June.
Reports a year 2006–2025 average
- Jefferson County 5.0
- Median Wisconsin county 3.5
Hail days 2006–2025
- Jefferson County 46
- Median Wisconsin county 37
Share 2 in or larger of sized reports
- Jefferson County 10%
- Median Wisconsin county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 8 | 1 | 9 | ||||||||||
| 2025 | 13 | 2 | 15 | ||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 4 | 2 | 1 | 7 | |||||||||
| 2022 | 7 | 7 | |||||||||||
| 2021 | 1 | 1 | 1 | 3 | |||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 1 | 1 | |||||||||||
| 2017 | 2 | 1 | 4 | 2 | 9 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 27, 2026 | 1 | 1.25 in | — |
| Apr 14, 2026 | 8 | 2.75 in | — |
| May 15, 2025 | 2 | 2.50 in | — |
| Apr 18, 2025 | 13 | 2.00 in | — |
| Feb 8, 2024 | 1 | 1.00 in | — |
| Oct 23, 2023 | 1 | 1.00 in | — |
| Aug 24, 2023 | 2 | 1.00 in | — |
| Apr 19, 2023 | 2 | 1.50 in | — |
| Apr 15, 2023 | 1 | 0.88 in | — |
| Apr 4, 2023 | 1 | 1.00 in | — |
| Jun 13, 2022 | 7 | 1.75 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| May 11, 2011 | 4.25 ingrapefruit | 4 W Jefferson | — | 13:34 local · NCEI |
| Apr 13, 2006 | 4.25 ingrapefruit | 3 NW Lake Mills | $4.4 million | 20:55 local · NCEI |
| May 14, 2001 | 3.75 inteacup | Watertown | $300K | 11:32 local · NCEI |
| Apr 14, 2026 | 2.75 inbaseball | 1.51 E Watertown Airport | — | 16:51 local · NCEI |
| May 11, 2011 | 2.75 inbaseball | Johnson Creek | — | 13:40 local · NCEI |
Size of every report
- Under 1 in 77 44%
- 1–2 in 83 47%
- 2 in + 17 10%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 27, 2026 | 1.25 inhalf dollar | 1.47 SSE Ixonia Arpt | 10:11 local · NCEI |
| Apr 14, 2026 | 1.00 inquarter | 4.1 NW Lake Mills | 17:00 local · NCEI |
| Apr 14, 2026 | 1.00 inquarter | 0.86 NW Waterloo | 16:54 local · NCEI |
| Apr 14, 2026 | 1.75 ingolf ball | 0.69 S Watertown | 16:52 local · NCEI |
| Apr 14, 2026 | 2.75 inbaseball | 1.51 E Watertown Airport | 16:51 local · NCEI |
| Apr 14, 2026 | 1.25 inhalf dollar | 0.86 SW Watertown | 16:50 local · NCEI |
| Apr 14, 2026 | 1.75 ingolf ball | 2.13 ENE Grellton | 16:48 local · NCEI |
| Apr 14, 2026 | 1.00 inquarter | 0.86 NW Waterloo | 16:48 local · NCEI |
| Apr 14, 2026 | 1.00 inquarter | 0.86 SW Watertown | 16:47 local · NCEI |
| May 15, 2025 | 1.75 ingolf ball | 2.13 NNW Ixonia Arpt | 17:14 local · NCEI |
| May 15, 2025 | 2.50 intennis ball | 0.86 SE Ixonia | 17:14 local · NCEI |
| Apr 18, 2025 | 1.00 inquarter | 2.61 ESE Grellton | 06:50 local · NCEI |
Cities and towns in Jefferson County
| Place | Reports | Largest |
|---|---|---|
| Watertown | 42 | 3.75 in |
| Lake Mills | 28 | 4.25 in |
| Fort Atkinson | 20 | 2.00 in |
| Waterloo | 18 | 2.00 in |
| Jefferson | 13 | 4.25 in |
| Johnson Creek | 11 | 2.75 in |
| Palmyra | 11 | 1.75 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 |
|---|---|---|---|
| Hebron | 4 | 4 | Mar 1, 2004 |
| Ixonia | 4 | 3 | May 15, 2025 |
| Lake Ripley | 4 | 4 | Feb 8, 2024 |
| Helenville | 3 | 2 | Jun 13, 2022 |
| Dousman | 2 | 2 | Jul 15, 2017 |
| Sullivan | 2 | 2 | Mar 1, 2004 |
| Rome | 1 | 1 | Oct 2, 2006 |
Questions about hail in Jefferson County
How often does it hail in Jefferson County, Wisconsin?
177 hail reports have been logged in Jefferson County since 1956. Over the 20 years 2006–2025 that averages 5.0 reports a year. That ranks #12 of 73 Wisconsin counties by number of reports.
When is hail season in Jefferson County?
Most reports come in May, April, June. May alone accounts for 25% of all reports.
What is the largest hail recorded in Jefferson County?
4.25 in (grapefruit size) on May 11, 2011 near 4 W Jefferson. 10% of reports here were 2 inches or larger.
When did it last hail in Jefferson County?
The most recent report in this data is from July 27, 2026 (1.25 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Jefferson County had in the last five years?
11 separate days with hail reports since November 3, 2021, adding up to 39 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.