Hail history for Keystone, Iowa
NOAA hail reports in and within about 5 km (3 miles) of Keystone since 1965, with preliminary reports to November 3, 2026.
Readout · Keystone
- Last hail
- May 16, 2019
- 0.88 in, nickel size
- Hail days, last 5 years
- 0
- since Nov 3, 2021 · 0 reports
- Largest ever
- 1.50 in
- ping pong ball · Aug 25, 1965
14 reports on 13 days since 1965 · #292 of 483 Iowa places
Hail map · Keystone
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Roof damage after hail? Get a free inspection
Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Keystone is from May 16, 2019. A local roofer can check and document it at no cost.
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What the record says about Keystone
The latest hail report in and around Keystone is from May 16, 2019, 0.88 in (nickel size). There has been no hail report here in the five years since November 3, 2021.
Over the 20 years 2006–2025, Keystone logged 8 reports on 7 hail days, about 0.4 reports a year. That is 11% less than the median Iowa town on this site (0.5 a year) and ranks #292 of 483 Iowa cities and towns on this site for all-time reports. Keystone accounts for 5% of the 278 reports filed in Benton 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 1.50 in (ping pong ball) on August 25, 1965.
Reports were down 40% in 2016–2025 (3) compared with 2006–2015 (5). The busiest year was 2008, with 3 reports on 2 days. Hail here peaks in May (29% of reports); 71% fall between April and June.
Reports a year 2006–2025 average
- Keystone 0.4
- Benton County 8.9
- Median Iowa town on this site 0.5
Hail days 2006–2025
- Keystone 7
- Benton County 75
- Median Iowa town on this site 7
Share 2 in or larger of sized reports
- Keystone 0%
- Benton County 4%
- 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 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 1 | 1 | 2 | ||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Largest hail on record
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| Aug 25, 1965 | 1.50 inping pong ball | — | Benton | — | 16:40 local · NCEI |
| Jun 14, 2008 | 1.00 inquarter | Keystone | Benton | — | 14:28 local · NCEI |
| Jun 14, 2008 | 1.00 inquarter | 2.07 S Keystone | Benton | — | 14:28 local · NCEI |
| May 21, 2004 | 1.00 inquarter | Keystone | Benton | $3K | 14:32 local · NCEI |
| May 16, 2019 | 0.88 innickel | Keystone | Benton | — | 19:25 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 10 71%
- 1–2 in 4 29%
- 2 in + 0 0%
Most recent reports
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| May 16, 2019 | 0.88 innickel | Keystone | Benton | — | 19:25 local · NCEI |
| Apr 22, 2019 | 0.88 innickel | Keystone | Benton | — | 14:15 local · NCEI |
| May 30, 2016 | 0.75 inpenny | 2.95 NNW Keystone | Benton | — | 19:45 local · NCEI |
| Jun 25, 2008 | 0.88 innickel | 3.3 SE Keystone | Benton | — | 20:20 local · NCEI |
| Jun 14, 2008 | 1.00 inquarter | Keystone | Benton | — | 14:28 local · NCEI |
| Jun 14, 2008 | 1.00 inquarter | 2.07 S Keystone | Benton | — | 14:28 local · NCEI |
| Apr 2, 2007 | 0.88 innickel | Keystone | Benton | — | 20:47 local · NCEI |
| Mar 31, 2007 | 0.75 inpenny | Keystone | Benton | — | 15:15 local · NCEI |
| Jun 4, 2005 | 0.88 innickel | 2 NE Williamsburg | Iowa | — | 21:44 local · NCEI |
| Mar 30, 2005 | 0.88 innickel | Keystone | Benton | — | 14:23 local · NCEI |
| May 21, 2004 | 1.00 inquarter | Keystone | Benton | $3K | 14:32 local · NCEI |
| May 14, 2003 | 0.88 innickel | Keystone | Benton | — | 15:55 local · NCEI |
Hail history near Keystone
Questions about hail in Keystone
How often does it hail in Keystone, Iowa?
14 hail reports have been logged in and within about 5 km (3 miles) of Keystone since 1965. Over the 20 years 2006–2025 that averages 0.4 reports a year. That ranks #292 of 483 Iowa places by number of reports.
When is hail season in Keystone?
Most reports come in May, June, March. May alone accounts for 29% of all reports.
What is the largest hail recorded in Keystone?
1.50 in (ping pong ball size) on August 25, 1965. 0% of reports here were 2 inches or larger.
When did it last hail in Keystone?
The most recent report in this data is from May 16, 2019 (0.88 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Keystone had in the last five years?
None: there has been no hail report in and within about 5 km (3 miles) of Keystone since November 3, 2021. The last one was on May 16, 2019.
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.