Hail history in Clayton County, IA
Hail of 1 inch or larger was reported in Clayton County on 5 days between Jan 1, 2025 and Oct 26, 2026. The largest was 2.50 in (tennis ball) on Apr 14, 2026, near Monona.
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Every hail day in Clayton County
| Storm day | Largest hail | Reports | Near | |
|---|---|---|---|---|
| Sep 4, 2026 | 1.50 in (ping pong ball) | 2 | Monona | Report for this date → |
| Jul 2, 2026 | 1.00 in (quarter) | 2 | Guttenberg | Report for this date → |
| Apr 14, 2026 | 2.50 in (tennis ball) | 1 | Monona | Report for this date → |
| Apr 18, 2025 | 1.00 in (quarter) | 1 | McGregor | Report for this date → |
| Apr 17, 2025 | 1.50 in (ping pong ball) | 4 | 3 SE Guttenberg | Report for this date → |
When hail falls in Clayton County
Where hail was reported
Places named in the reports, given as distance and direction from the nearest town, as the National Weather Service logs them.
- Guttenberg2 reports
- Monona2 reports
- 1 W Giard1 report
- 2 WSW Osterdock1 report
- 3 SE Guttenberg1 report
- Mcgregor1 report
- McGregor1 report
- Osborne1 report
More hail history in Iowa
See a sample satellite hail report →
Source and method
NOAA Storm Prediction Center preliminary local storm reports of hail 1 inch or larger, Jan 1, 2025 to Oct 26, 2026 (updated Oct 27, 2026). Dates are SPC storm days, which run from 12:00 UTC to 12:00 UTC (about 7 a.m. to 7 a.m. Central), so a late-night storm appears on the day it started. Reports come from spotters, the public and NWS offices: they can be revised, and a storm nobody reported is missing. SPC storm reports.
A Skybridge report goes further for one address and date: GOES satellite cloud-top and lightning data, NOAA MRMS radar hail size and these storm reports within 50 km, in one document reviewed by a person, with a code anyone can verify.