Hail history for Jefferson, Iowa
NOAA hail reports in and within about 5 km (3 miles) of Jefferson since 1960, with preliminary reports to November 3, 2026.
Readout · Jefferson
- Last hail
- Oct 8, 2026
- 1.00 in, quarter size · preliminary
- Hail days, last 5 years
- 1
- since Nov 3, 2021 · 1 report
- Largest ever
- 2.75 in
- baseball · Apr 24, 1960
20 reports on 18 days since 1960 · #161 of 483 Iowa places
Hail map · Jefferson
- 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 Jefferson is from October 8, 2026. A local roofer can check and document it at no cost.
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What the record says about Jefferson
The latest hail report in and around Jefferson is from October 8, 2026, 1.00 in (quarter size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 1.00 in on October 8, 2026.
Over the 20 years 2006–2025, Jefferson logged 7 reports on 6 hail days, about 0.3 reports a year. That is 22% less than the median Iowa town on this site (0.5 a year) and ranks #161 of 483 Iowa cities and towns on this site for all-time reports. Jefferson accounts for 16% of the 124 reports filed in Greene County.
5% 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 April 24, 1960.
The busiest year was 2013, with 2 reports on 1 day. Hail here peaks in April (30% of reports); 80% fall between April and June.
Reports a year 2006–2025 average
- Jefferson 0.3
- Greene County 2.8
- Median Iowa town on this site 0.5
Hail days 2006–2025
- Jefferson 6
- Greene County 33
- Median Iowa town on this site 7
Share 2 in or larger of sized reports
- Jefferson 5%
- Greene County 7%
- 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 | |||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 1 | 1 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Oct 8, 2026 | 1 | 1.00 in | View |
Largest hail on record
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| Apr 24, 1960 | 2.75 inbaseball | — | Greene | — | 20:00 local · NCEI |
| May 30, 1998 | 1.75 ingolf ball | Jefferson | Greene | $25K | 12:05 local · NCEI |
| May 17, 1991 | 1.75 ingolf ball | — | Greene | — | 14:17 local · NCEI |
| Apr 29, 1986 | 1.75 ingolf ball | — | Greene | — | 15:28 local · NCEI |
| Apr 29, 1986 | 1.75 ingolf ball | — | Greene | — | 14:28 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 3 15%
- 1–2 in 16 80%
- 2 in + 1 5%
Most recent reports
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| Oct 8, 2026 | 1.00 inquarter | 3 W Jefferson | Greene | — | 04:15 UTC · NWS prelim. |
| Sep 14, 2019 | 1.00 inquarter | 0.69 N Jefferson | Greene | — | 13:50 local · NCEI |
| Jun 12, 2017 | 1.00 inquarter | Jefferson | Greene | — | 15:09 local · NCEI |
| May 11, 2014 | 1.00 inquarter | 0.51 W Jefferson Muni Arpt | Greene | — | 21:20 local · NCEI |
| Jun 14, 2013 | 1.00 inquarter | 3.08 WSW Jefferson | Greene | — | 20:26 local · NCEI |
| Jun 14, 2013 | 1.00 inquarter | 1.69 WNW Jefferson | Greene | $3K | 19:54 local · NCEI |
| Apr 24, 2008 | 0.88 innickel | Jefferson | Greene | $1K | 19:25 local · NCEI |
| Jun 21, 2007 | 0.88 innickel | Jefferson | Greene | $2K | 15:00 local · NCEI |
| Jun 27, 2005 | 0.88 innickel | Jefferson | Greene | $2K | 15:38 local · NCEI |
| Apr 8, 1999 | 1.00 inquarter | Jefferson | Greene | $5K | 11:10 local · NCEI |
| May 30, 1998 | 1.75 ingolf ball | Jefferson | Greene | $25K | 12:05 local · NCEI |
| May 17, 1991 | 1.75 ingolf ball | — | Greene | — | 14:17 local · NCEI |
Hail history near Jefferson
Questions about hail in Jefferson
How often does it hail in Jefferson, Iowa?
20 hail reports have been logged in and within about 5 km (3 miles) of Jefferson since 1960. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #161 of 483 Iowa places by number of reports.
When is hail season in Jefferson?
Most reports come in April, May, June. April alone accounts for 30% of all reports.
What is the largest hail recorded in Jefferson?
2.75 in (baseball size) on April 24, 1960. 5% of reports here were 2 inches or larger.
When did it last hail in Jefferson?
The most recent report in this data is from October 8, 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 Jefferson had in the last five years?
1 separate days with hail reports since November 3, 2021, adding up to 1 reports. The most recent was October 8, 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.