Hail history for Clayton County, Iowa
Every NOAA hail report filed in Clayton County since 1961, with preliminary National Weather Service reports to November 3, 2026.
Readout · Clayton County
- Last hail
- Sep 4, 2026
- 1.00 in, quarter size · preliminary
- Hail days, last 5 years
- 8
- since Nov 3, 2021 · 16 reports
- Largest ever
- 2.50 in
- tennis ball · Apr 14, 2026
146 reports on 73 days since 1961 · #44 of 100 Iowa counties
Hail map · Clayton 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 Clayton County
The latest hail report in Clayton County is from September 4, 2026, 1.00 in (quarter size). Since November 3, 2021 there have been 8 separate hail days; the biggest stones in that time were 2.50 in on April 14, 2026.
Over the 20 years 2006–2025, Clayton County logged 83 reports on 34 hail days, about 4.2 reports a year. That is 12% more than the median Iowa county (3.7 a year) and ranks #44 of 100 Iowa counties for all-time reports. Clayton County holds 1% of all 16,032 hail reports in Iowa.
2% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Iowa county. The largest hail on record here is 2.50 in (tennis ball) on April 14, 2026 near 0.5 E Monona.
Reports were down 37% in 2016–2025 (32) compared with 2006–2015 (51). The busiest year was 2008, with 14 reports on 3 days. Hail here peaks in May (24% of reports); 58% fall between April and June.
Reports a year 2006–2025 average
- Clayton County 4.2
- Median Iowa county 3.7
Hail days 2006–2025
- Clayton County 34
- Median Iowa county 39.5
Share 2 in or larger of sized reports
- Clayton County 2%
- Median Iowa county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 2 | 2 | 5 | |||||||||
| 2025 | 5 | 5 | |||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 1 | 1 | |||||||||||
| 2022 | 2 | 2 | 4 | ||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 3 | 3 | |||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 1 | 1 | 1 | 3 | |||||||||
| 2017 | 4 | 1 | 7 | 12 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Sep 4, 2026 | 2 | 1.50 in | View |
| Jul 2, 2026 | 2 | 1.00 in | — |
| Apr 14, 2026 | 1 | 2.50 in | — |
| Apr 18, 2025 | 5 | 1.50 in | — |
| Jul 15, 2024 | 1 | 0.88 in | — |
| Apr 4, 2023 | 1 | 1.00 in | — |
| Jul 4, 2022 | 2 | 1.00 in | — |
| Jun 28, 2022 | 2 | 0.88 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| Apr 14, 2026 | 2.50 intennis ball | 0.5 E Monona | $225K | 15:09 local · NCEI |
| Jun 21, 1997 | 2.00 inhen egg | Strawberry Point | $20K | 00:30 local · NCEI |
| May 30, 1989 | 2.00 inhen egg | — | — | 08:15 local · NCEI |
| Jul 12, 2017 | 1.75 ingolf ball | 2.13 SSE Osterdock | $8K | 08:48 local · NCEI |
| Jul 11, 2017 | 1.75 ingolf ball | 2.13 NNE Garber | $15K | 20:53 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 59 40%
- 1–2 in 84 58%
- 2 in + 3 2%
Most recent reports
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| Sep 4, 2026 | 1.00 inquarter | 1 W Giard | — | 21:35 UTC · NWS prelim. |
| Sep 4, 2026 | 1.50 inping pong ball | Monona | — | 21:23 UTC · NWS prelim. |
| Jul 2, 2026 | 1.00 inquarter | Guttenburg | — | 14:00 local · NCEI |
| Jul 2, 2026 | 1.00 inquarter | 0.69 N Guttenburg | — | 13:56 local · NCEI |
| Apr 14, 2026 | 2.50 intennis ball | 0.5 E Monona | $225K | 15:09 local · NCEI |
| Apr 18, 2025 | 1.00 inquarter | Mc Gregor | — | 05:20 local · NCEI |
| Apr 18, 2025 | 1.00 inquarter | 1.23 SW Osborne | — | 05:11 local · NCEI |
| Apr 18, 2025 | 1.50 inping pong ball | 2.13 SSE Guttenburg | — | 04:18 local · NCEI |
| Apr 18, 2025 | 1.25 inhalf dollar | 3.6 SSW Osterdock | — | 04:12 local · NCEI |
| Apr 18, 2025 | 0.88 innickel | Mc Gregor | — | 04:05 local · NCEI |
| Jul 15, 2024 | 0.88 innickel | 2.03 E Millville | — | 16:20 local · NCEI |
| Apr 4, 2023 | 1.00 inquarter | 0.51 W Strawberry Pt | — | 20:15 local · NCEI |
Cities and towns in Clayton County
| Place | Reports | Largest |
|---|---|---|
| Edgewood | 24 | 2.50 in |
| Strawberry Point | 18 | 2.00 in |
| Elkader | 13 | 1.75 in |
| Guttenberg | 13 | 1.75 in |
| Monona | 13 | 2.50 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 |
|---|---|---|---|
| McGregor | 8 | 7 | Apr 18, 2025 |
| Elkport | 7 | 6 | Jul 4, 2022 |
| Volga | 7 | 5 | Jul 12, 2017 |
| Osterdock | 6 | 6 | Apr 18, 2025 |
| Luana | 5 | 4 | May 31, 2008 |
| St. Olaf | 5 | 5 | Mar 23, 2017 |
| Garnavillo | 4 | 4 | Jul 11, 2017 |
| Clayton | 3 | 1 | Apr 18, 1996 |
| North Buena Vista | 3 | 3 | Jul 11, 2017 |
| Garber | 2 | 2 | Jul 11, 2017 |
| Farmersburg | 1 | 1 | May 31, 2008 |
| Marquette | 1 | 1 | Sep 4, 2012 |
Questions about hail in Clayton County
How often does it hail in Clayton County, Iowa?
146 hail reports have been logged in Clayton County since 1961. Over the 20 years 2006–2025 that averages 4.2 reports a year. That ranks #44 of 100 Iowa counties by number of reports.
When is hail season in Clayton County?
Most reports come in May, July, June. May alone accounts for 24% of all reports.
What is the largest hail recorded in Clayton County?
2.50 in (tennis ball size) on April 14, 2026 near 0.5 E Monona. 2% of reports here were 2 inches or larger.
When did it last hail in Clayton County?
The most recent report in this data is from September 4, 2026 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Clayton County had in the last five years?
8 separate days with hail reports since November 3, 2021, adding up to 16 reports. The most recent was September 4, 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.