Hail history for Grafton, Wisconsin
NOAA hail reports in and within about 5 km (3 miles) of Grafton since 1961, with preliminary reports to November 3, 2026.
Readout · Grafton
- Last hail
- May 7, 2024
- 0.75 in, penny size
- Hail days, last 5 years
- 2
- since Nov 3, 2021 · 2 reports
- Largest ever
- 2.50 in
- tennis ball · Jul 27, 1989
12 reports on 9 days since 1961 · #186 of 271 Wisconsin places
Hail map · Grafton
- 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 Grafton
The latest hail report in and around Grafton is from May 7, 2024, 0.75 in (penny size). Since November 3, 2021 there have been 2 separate hail days; the biggest stones in that time were 1.00 in on April 19, 2023.
Over the 20 years 2006–2025, Grafton logged 8 reports on 5 hail days, about 0.4 reports a year. That is 11% less than the median Wisconsin town on this site (0.5 a year) and ranks #186 of 271 Wisconsin cities and towns on this site for all-time reports. Grafton accounts for 17% of the 71 reports filed in Ozaukee County.
17% 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, 1989.
Reports were up 200% in 2016–2025 (6) compared with 2006–2015 (2). The busiest year was 2020, with 4 reports on 1 day. Hail here peaks in April (42% of reports); 67% fall between April and June.
Reports a year 2006–2025 average
- Grafton 0.4
- Ozaukee County 2.1
- Median Wisconsin town on this site 0.5
Hail days 2006–2025
- Grafton 5
- Ozaukee County 22
- Median Wisconsin town on this site 7
Share 2 in or larger of sized reports
- Grafton 17%
- Ozaukee County 9%
- 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 | 0 | ||||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 1 | 1 | |||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 4 | 4 | |||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| May 7, 2024 | 1 | 0.75 in | — |
| Apr 19, 2023 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 27, 1989 | 2.50 intennis ball | — | Ozaukee | 12:51 local · NCEI |
| Apr 7, 2020 | 2.00 inhen egg | Grafton | Ozaukee | 15:14 local · NCEI |
| Apr 7, 2020 | 1.50 inping pong ball | 1.22 NE Grafton | Ozaukee | 15:22 local · NCEI |
| Apr 19, 2023 | 1.00 inquarter | 0.5 W Grafton | Ozaukee | 14:44 local · NCEI |
| Apr 7, 2020 | 1.00 inquarter | 1.66 ESE Grafton | Ozaukee | 15:15 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 5 42%
- 1–2 in 5 42%
- 2 in + 2 17%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| May 7, 2024 | 0.75 inpenny | 0.5 W Grafton | Ozaukee | 20:08 local · NCEI |
| Apr 19, 2023 | 1.00 inquarter | 0.5 W Grafton | Ozaukee | 14:44 local · NCEI |
| Apr 7, 2020 | 1.50 inping pong ball | 1.22 NE Grafton | Ozaukee | 15:22 local · NCEI |
| Apr 7, 2020 | 1.00 inquarter | 1.66 ESE Grafton | Ozaukee | 15:15 local · NCEI |
| Apr 7, 2020 | 2.00 inhen egg | Grafton | Ozaukee | 15:14 local · NCEI |
| Apr 7, 2020 | 1.00 inquarter | 0.5 W Grafton | Ozaukee | 15:14 local · NCEI |
| May 2, 2008 | 0.75 inpenny | 2 NW Grafton | Ozaukee | 18:30 local · NCEI |
| Sep 8, 2006 | 0.75 inpenny | 3 ENE Grafton | Ozaukee | 15:40 local · NCEI |
| Jul 20, 1998 | 0.75 inpenny | 3 SW Port Washington | Ozaukee | 23:40 local · NCEI |
| Jul 27, 1989 | 2.50 intennis ball | — | Ozaukee | 12:51 local · NCEI |
| Jul 19, 1975 | 1.00 inquarter | — | Ozaukee | 15:28 local · NCEI |
| Jun 22, 1961 | 0.75 inpenny | — | Ozaukee | 15:15 local · NCEI |
Hail history near Grafton
- Cedarburg 4 km · 19
- Port Washington 9 km · 10
- Mequon 13 km · 21
- Germantown 17 km · 31
- West Bend 22 km · 23
- Menomonee Falls 23 km · 16
- Richfield 25 km · 10
- Milwaukee 29 km · 97
Questions about hail in Grafton
How often does it hail in Grafton, Wisconsin?
12 hail reports have been logged in and within about 5 km (3 miles) of Grafton since 1961. Over the 20 years 2006–2025 that averages 0.4 reports a year. That ranks #186 of 271 Wisconsin places by number of reports.
When is hail season in Grafton?
Most reports come in April, July, May. April alone accounts for 42% of all reports.
What is the largest hail recorded in Grafton?
2.50 in (tennis ball size) on July 27, 1989. 17% of reports here were 2 inches or larger.
When did it last hail in Grafton?
The most recent report in this data is from May 7, 2024 (0.75 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Grafton had in the last five years?
2 separate days with hail reports since November 3, 2021, adding up to 2 reports. The most recent was May 7, 2024.
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.