Hail history for Knoxville, Iowa
NOAA hail reports in and within about 5 km (3 miles) of Knoxville since 1957, with preliminary reports to November 3, 2026.
Readout · Knoxville
- Last hail
- May 19, 2025
- 1.00 in, quarter size
- Hail days, last 5 years
- 4
- since Nov 3, 2021 · 6 reports
- Largest ever
- 2.75 in
- baseball · Jun 14, 1980
47 reports on 32 days since 1957 · #32 of 483 Iowa places
Hail map · Knoxville
- 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 Knoxville is from May 19, 2025. A local roofer can check and document it at no cost.
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What the record says about Knoxville
The latest hail report in and around Knoxville is from May 19, 2025, 1.00 in (quarter size). Since November 3, 2021 there have been 4 separate hail days; the biggest stones in that time were 1.25 in on March 31, 2023.
Over the 20 years 2006–2025, Knoxville logged 30 reports on 19 hail days, about 1.5 reports a year. That is 3.3 times the median Iowa town on this site (0.5 a year) and ranks #32 of 483 Iowa cities and towns on this site for all-time reports. Knoxville accounts for 24% of the 196 reports filed in Marion County.
9% 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 2.75 in (baseball) on June 14, 1980.
Reports were down 42% in 2016–2025 (11) compared with 2006–2015 (19). The busiest year was 2010, with 9 reports on 3 days. Hail here peaks in April (28% of reports); 72% fall between April and June.
Reports a year 2006–2025 average
- Knoxville 1.5
- Marion County 6.5
- Median Iowa town on this site 0.5
Hail days 2006–2025
- Knoxville 19
- Marion County 56
- Median Iowa town on this site 7
Share 2 in or larger of sized reports
- Knoxville 9%
- Marion County 8%
- 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 | 3 | 1 | 1 | 5 | |||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 2 | 2 | |||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 1 | 1 | |||||||||||
| 2017 | 1 | 1 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| May 19, 2025 | 1 | 1.00 in | — |
| Jul 17, 2023 | 1 | 1.00 in | — |
| May 13, 2023 | 1 | 1.00 in | — |
| Mar 31, 2023 | 3 | 1.25 in | — |
Largest hail on record
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| Jun 14, 1980 | 2.75 inbaseball | — | Marion | — | 18:50 local · NCEI |
| Apr 16, 1960 | 2.75 inbaseball | — | Marion | — | 11:30 local · NCEI |
| Jul 27, 2008 | 2.50 intennis ball | Knoxville | Marion | $100K | 22:33 local · NCEI |
| Jun 18, 2021 | 2.00 inhen egg | 1.56 E Knoxville | Marion | — | 22:09 local · NCEI |
| Apr 5, 2010 | 1.75 ingolf ball | Knoxville | Marion | $10K | 14:54 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 12 26%
- 1–2 in 31 66%
- 2 in + 4 9%
Most recent reports
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| May 19, 2025 | 1.00 inquarter | 1.25 WSW Knoxville Arpt | Marion | — | 14:57 local · NCEI |
| Jul 17, 2023 | 1.00 inquarter | Knoxville | Marion | — | 06:53 local · NCEI |
| May 13, 2023 | 1.00 inquarter | 1.48 NNW Knoxville | Marion | — | 14:26 local · NCEI |
| Mar 31, 2023 | 1.00 inquarter | 1.25 WNW Knoxville | Marion | — | 14:09 local · NCEI |
| Mar 31, 2023 | 1.25 inhalf dollar | Knoxville | Marion | — | 14:08 local · NCEI |
| Mar 31, 2023 | 1.00 inquarter | Knoxville | Marion | — | 14:08 local · NCEI |
| Jun 18, 2021 | 2.00 inhen egg | 1.56 E Knoxville | Marion | — | 22:09 local · NCEI |
| Jun 18, 2021 | 1.25 inhalf dollar | Knoxville | Marion | — | 22:06 local · NCEI |
| May 25, 2019 | 1.00 inquarter | Knoxville | Marion | — | 18:35 local · NCEI |
| Sep 1, 2018 | 0.75 inpenny | Knoxville | Marion | — | 01:33 local · NCEI |
| Apr 9, 2017 | 1.00 inquarter | Knoxville | Marion | — | 23:31 local · NCEI |
| Jul 28, 2015 | 1.00 inquarter | 2.95 NNW Flagler | Marion | $5K | 16:52 local · NCEI |
Hail history near Knoxville
- Melcher-Dallas 15 km · 18
- Pleasantville 16 km · 23
- Pella 18 km · 42
- Monroe 22 km · 29
- Milo 28 km · 16
- Lacona 28 km · 10
- Hartford 30 km · 14
- Reasnor 30 km · 14
Questions about hail in Knoxville
How often does it hail in Knoxville, Iowa?
47 hail reports have been logged in and within about 5 km (3 miles) of Knoxville since 1957. Over the 20 years 2006–2025 that averages 1.5 reports a year. That ranks #32 of 483 Iowa places by number of reports.
When is hail season in Knoxville?
Most reports come in April, May, June. April alone accounts for 28% of all reports.
What is the largest hail recorded in Knoxville?
2.75 in (baseball size) on June 14, 1980. 9% of reports here were 2 inches or larger.
When did it last hail in Knoxville?
The most recent report in this data is from May 19, 2025 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Knoxville had in the last five years?
4 separate days with hail reports since November 3, 2021, adding up to 6 reports. The most recent was May 19, 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.