Hail history for Monona, Iowa
NOAA hail reports in and within about 5 km (3 miles) of Monona since 1958, with preliminary reports to November 3, 2026.
Readout · Monona
- Last hail
- Sep 4, 2026
- 1.50 in, ping pong ball size · preliminary
- Hail days, last 5 years
- 2
- since Nov 3, 2021 · 2 reports
- Largest ever
- 2.50 in
- tennis ball · Apr 14, 2026
13 reports on 10 days since 1958 · #330 of 483 Iowa places
Hail map · Monona
- 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 Monona
The latest hail report in and around Monona is from September 4, 2026, 1.50 in (ping pong ball size). Since November 3, 2021 there have been 2 separate hail days; the biggest stones in that time were 2.50 in on April 14, 2026.
Over the 20 years 2006–2025, Monona logged 4 reports on 3 hail days, about 0.2 reports a year. That is about half the median Iowa town on this site (0.5 a year) and ranks #330 of 483 Iowa cities and towns on this site for all-time reports. Monona accounts for 9% of the 146 reports filed in Clayton County.
23% 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 2.50 in (tennis ball) on April 14, 2026 near 0.5 E Monona.
The busiest year was 2026, with 2 reports on 2 days. Hail here peaks in May (38% of reports); 62% fall between April and June.
Reports a year 2006–2025 average
- Monona 0.2
- Clayton County 4.2
- Median Iowa town on this site 0.5
Hail days 2006–2025
- Monona 3
- Clayton County 34
- Median Iowa town on this site 7
Share 2 in or larger of sized reports
- Monona 23%
- Clayton County 2%
- 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 | 1 | 1 | 2 | ||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 2 | 2 | |||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 1 | 1 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Sep 4, 2026 | 1 | 1.50 in | View |
| Apr 14, 2026 | 1 | 2.50 in | — |
Largest hail on record
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| Apr 14, 2026 | 2.50 intennis ball | 0.5 E Monona | Clayton | $225K | 15:09 local · NCEI |
| Jul 3, 1969 | 2.00 inhen egg | — | Allamakee | — | 11:30 local · NCEI |
| May 26, 1958 | 2.00 inhen egg | — | Allamakee | — | 19:00 local · NCEI |
| May 17, 2000 | 1.75 ingolf ball | 2 S Monona | Clayton | $5K | 11:47 local · NCEI |
| Sep 8, 1985 | 1.75 ingolf ball | — | Clayton | — | 22:34 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 38%
- 1–2 in 5 38%
- 2 in + 3 23%
Most recent reports
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| Sep 4, 2026 | 1.50 inping pong ball | Monona | Clayton | — | 21:23 UTC · NWS prelim. |
| Apr 14, 2026 | 2.50 intennis ball | 0.5 E Monona | Clayton | $225K | 15:09 local · NCEI |
| Mar 28, 2020 | 0.75 inpenny | 0.5 E Monona | Clayton | — | 18:21 local · NCEI |
| Mar 28, 2020 | 1.00 inquarter | 0.5 E Monona | Clayton | — | 18:20 local · NCEI |
| May 15, 2017 | 1.25 inhalf dollar | 0.5 E Monona | Clayton | — | 18:22 local · NCEI |
| May 31, 2008 | 0.75 inpenny | 1.71 SW Monona | Clayton | — | 17:44 local · NCEI |
| May 17, 2000 | 0.88 innickel | Monona | Clayton | — | 12:00 local · NCEI |
| May 17, 2000 | 1.75 ingolf ball | 2 S Monona | Clayton | $5K | 11:47 local · NCEI |
| Jun 14, 1991 | 0.75 inpenny | — | Clayton | — | 16:53 local · NCEI |
| Jun 14, 1991 | 0.75 inpenny | — | Clayton | — | 16:15 local · NCEI |
| Sep 8, 1985 | 1.75 ingolf ball | — | Clayton | — | 22:34 local · NCEI |
| Jul 3, 1969 | 2.00 inhen egg | — | Allamakee | — | 11:30 local · NCEI |
Hail history near Monona
- Postville 15 km · 13
- Elkader 21 km · 13
- Waukon 25 km · 15
- Ossian 32 km · 13
- West Union 36 km · 14
- Lansing 37 km · 14
- Guttenberg 37 km · 13
- Calmar 41 km · 26
Questions about hail in Monona
How often does it hail in Monona, Iowa?
13 hail reports have been logged in and within about 5 km (3 miles) of Monona since 1958. Over the 20 years 2006–2025 that averages 0.2 reports a year. That ranks #330 of 483 Iowa places by number of reports.
When is hail season in Monona?
Most reports come in May, March, June. May alone accounts for 38% of all reports.
What is the largest hail recorded in Monona?
2.50 in (tennis ball size) on April 14, 2026 near 0.5 E Monona. 23% of reports here were 2 inches or larger.
When did it last hail in Monona?
The most recent report in this data is from September 4, 2026 (1.50 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Monona 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 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.