Hail history for Grafton, Iowa
NOAA hail reports in and within about 5 km (3 miles) of Grafton since 1987, with preliminary reports to November 5, 2026.
Readout · Grafton
- Last hail
- Sep 22, 2025
- 1.00 in, quarter size
- Hail days, last 5 years
- 2
- since Nov 5, 2021 · 2 reports
- Largest ever
- 1.75 in
- golf ball · Jul 14, 1987
10 reports on 8 days since 1987 · #451 of 483 Iowa 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 September 22, 2025, 1.00 in (quarter size). Since November 5, 2021 there have been 2 separate hail days; the biggest stones in that time were 1.00 in on September 22, 2025.
Over the 20 years 2006–2025, Grafton logged 6 reports on 5 hail days, about 0.3 reports a year. That is 33% less than the median Iowa town on this site (0.5 a year) and ranks #451 of 483 Iowa cities and towns on this site for all-time reports. Grafton accounts for 11% of the 95 reports filed in Worth County.
0% of reports with a size were 2 inches (hen egg) or larger, against 6% for the median Iowa town on this site. The largest hail on record here is 1.75 in (golf ball) on July 14, 1987.
The busiest year was 2013, with 2 reports on 1 day. Hail here peaks in May (50% of reports); 80% fall between April and June.
Reports a year 2006–2025 average
- Grafton 0.3
- Worth County 2.0
- Median Iowa town on this site 0.5
Hail days 2006–2025
- Grafton 5
- Worth County 24
- Median Iowa town on this site 7
Share 2 in or larger of sized reports
- Grafton 0%
- Worth County 5%
- Median Iowa 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 | 1 | 1 | |||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 1 | 1 | |||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 1 | 1 |
Hail days since Nov 5, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Sep 22, 2025 | 1 | 1.00 in | — |
| Apr 12, 2022 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 14, 1987 | 1.75 ingolf ball | — | Worth | 15:40 local · NCEI |
| Apr 9, 2017 | 1.50 inping pong ball | 0.5 E Grafton | Worth | 20:40 local · NCEI |
| Sep 22, 2025 | 1.00 inquarter | Grafton | Worth | 16:17 local · NCEI |
| Apr 12, 2022 | 1.00 inquarter | 1.74 N Grafton | Worth | 20:11 local · NCEI |
| May 26, 2016 | 1.00 inquarter | 0.5 E Grafton | Worth | 02:00 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 2 20%
- 1–2 in 8 80%
- 2 in + 0 0%
Most recent reports
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| Sep 22, 2025 | 1.00 inquarter | Grafton | Worth | — | 16:17 local · NCEI |
| Apr 12, 2022 | 1.00 inquarter | 1.74 N Grafton | Worth | — | 20:11 local · NCEI |
| Apr 9, 2017 | 1.50 inping pong ball | 0.5 E Grafton | Worth | — | 20:40 local · NCEI |
| May 26, 2016 | 1.00 inquarter | 0.5 E Grafton | Worth | — | 02:00 local · NCEI |
| May 31, 2013 | 1.00 inquarter | Grafton | Worth | $2K | 21:50 local · NCEI |
| May 31, 2013 | 1.00 inquarter | Grafton | Worth | $2K | 21:16 local · NCEI |
| Jun 8, 2004 | 0.88 innickel | Grafton | Worth | $1K | 19:20 local · NCEI |
| May 31, 2000 | 1.00 inquarter | Grafton | Worth | $5K | 20:50 local · NCEI |
| May 31, 2000 | 0.75 inpenny | Grafton | Worth | — | 20:43 local · NCEI |
| Jul 14, 1987 | 1.75 ingolf ball | — | Worth | — | 15:40 local · NCEI |
Hail history near Grafton
- Manly 12 km · 17
- Kensett 12 km · 13
- St. Ansgar 13 km · 24
- Northwood 17 km · 17
- Nora Springs 21 km · 13
- Osage 22 km · 18
- Mason City 23 km · 71
- Stacyville 26 km · 11
Questions about hail in Grafton
How often does it hail in Grafton, Iowa?
10 hail reports have been logged in and within about 5 km (3 miles) of Grafton since 1987. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #451 of 483 Iowa places by number of reports.
When is hail season in Grafton?
Most reports come in May, April, June. May alone accounts for 50% of all reports.
What is the largest hail recorded in Grafton?
1.75 in (golf ball size) on July 14, 1987. 0% of reports here were 2 inches or larger.
When did it last hail in Grafton?
The most recent report in this data is from September 22, 2025 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 5, 2026.
How many hail storms has Grafton had in the last five years?
2 separate days with hail reports since November 5, 2021, adding up to 2 reports. The most recent was September 22, 2025.
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.