Hail history for Jefferson County, Iowa
Every NOAA hail report filed in Jefferson County since 1960, with preliminary National Weather Service reports to November 3, 2026.
Readout · Jefferson County
- Last hail
- Aug 7, 2026
- 1.75 in, golf ball size · preliminary
- Hail days, last 5 years
- 6
- since Nov 3, 2021 · 10 reports
- Largest ever
- 3.75 in
- teacup · Jun 28, 1976
94 reports on 56 days since 1960 · #89 of 100 Iowa counties
Hail map · Jefferson County
- 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 Jefferson County
The latest hail report in Jefferson County is from August 7, 2026, 1.75 in (golf ball size). Since November 3, 2021 there have been 6 separate hail days; the biggest stones in that time were 2.00 in on April 14, 2026.
Over the 20 years 2006–2025, Jefferson County logged 58 reports on 31 hail days, about 2.9 reports a year. That is 22% less than the median Iowa county (3.7 a year) and ranks #89 of 100 Iowa counties for all-time reports. Jefferson County holds 1% of all 16,032 hail reports in Iowa.
3% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Iowa county. The largest hail on record here is 3.75 in (teacup) on June 28, 1976.
Reports were down 82% in 2016–2025 (9) compared with 2006–2015 (49). The busiest year was 2011, with 12 reports on 4 days. Hail here peaks in April (24% of reports); 67% fall between April and June.
Reports a year 2006–2025 average
- Jefferson County 2.9
- Median Iowa county 3.7
Hail days 2006–2025
- Jefferson County 31
- Median Iowa county 39.5
Share 2 in or larger of sized reports
- Jefferson County 3%
- Median Iowa county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 3 | 2 | 1 | 6 | |||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 3 | 3 | |||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 3 | 3 | |||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 1 | 1 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Aug 7, 2026 | 1 | 1.75 in | View |
| Apr 14, 2026 | 2 | 2.00 in | — |
| Mar 10, 2026 | 3 | 1.50 in | — |
| Oct 24, 2024 | 1 | 0.75 in | — |
| May 7, 2023 | 1 | 1.75 in | — |
| May 6, 2023 | 2 | 1.25 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 28, 1976 | 3.75 inteacup | — | 02:15 local · NCEI |
| Jun 19, 1964 | 3.00 inteacup | — | 14:00 local · NCEI |
| Apr 14, 2026 | 2.00 inhen egg | Packwood | 16:37 local · NCEI |
| Aug 7, 2026 | 1.75 ingolf ball | Packwood | 02:15 UTC · NWS prelim. |
| May 7, 2023 | 1.75 ingolf ball | 2.69 WNW Perlee | 17:35 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 38 40%
- 1–2 in 53 56%
- 2 in + 3 3%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Aug 7, 2026 | 1.75 ingolf ball | Packwood | 02:15 UTC · NWS prelim. |
| Apr 14, 2026 | 1.00 inquarter | 2.07 N Middlekoop Fld Arpt | 16:40 local · NCEI |
| Apr 14, 2026 | 2.00 inhen egg | Packwood | 16:37 local · NCEI |
| Mar 10, 2026 | 1.00 inquarter | 0.69 S Perlee | 17:45 local · NCEI |
| Mar 10, 2026 | 1.00 inquarter | 0.52 E Fairfield Muni Arpt | 17:40 local · NCEI |
| Mar 10, 2026 | 1.50 inping pong ball | 0.69 S Batavia | 17:23 local · NCEI |
| Oct 24, 2024 | 0.75 inpenny | 1.48 SSE Fairfield Muni Arpt | 21:42 local · NCEI |
| May 7, 2023 | 1.75 ingolf ball | 2.69 WNW Perlee | 17:35 local · NCEI |
| May 6, 2023 | 1.25 inhalf dollar | 1.73 SW Fairfield | 21:41 local · NCEI |
| May 6, 2023 | 1.00 inquarter | 2.95 ESE Batavia | 21:34 local · NCEI |
| Jun 22, 2021 | 1.00 inquarter | 0.52 E Libertyville | 18:16 local · NCEI |
| Jun 22, 2021 | 0.75 inpenny | 0.69 N Libertyville | 18:13 local · NCEI |
Cities and towns in Jefferson County
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Packwood | 9 | 7 | Aug 7, 2026 |
| Libertyville | 7 | 6 | Jun 22, 2021 |
| Lockridge | 4 | 3 | Jun 16, 2014 |
| Maharishi Vedic City | 4 | 4 | May 7, 2023 |
| Pleasant Plain | 4 | 4 | Apr 14, 2026 |
Questions about hail in Jefferson County
How often does it hail in Jefferson County, Iowa?
94 hail reports have been logged in Jefferson County since 1960. Over the 20 years 2006–2025 that averages 2.9 reports a year. That ranks #89 of 100 Iowa counties by number of reports.
When is hail season in Jefferson County?
Most reports come in April, May, June. April alone accounts for 24% of all reports.
What is the largest hail recorded in Jefferson County?
3.75 in (teacup size) on June 28, 1976. 3% of reports here were 2 inches or larger.
When did it last hail in Jefferson County?
The most recent report in this data is from August 7, 2026 (1.75 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Jefferson County had in the last five years?
6 separate days with hail reports since November 3, 2021, adding up to 10 reports. The most recent was August 7, 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.