Hail history for Petroleum County, Montana
Every NOAA hail report filed in Petroleum County since 1963, with preliminary National Weather Service reports to November 3, 2026.
Readout · Petroleum County
- Last hail
- Jul 17, 2025
- 1.75 in, golf ball size
- Hail days, last 5 years
- 6
- since Nov 3, 2021 · 11 reports
- Largest ever
- 3.50 in
- teacup · Jun 15, 2025
115 reports on 74 days since 1963 · #30 of 57 Montana counties
Hail map · Petroleum 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 Petroleum County
The latest hail report in Petroleum County is from July 17, 2025, 1.75 in (golf ball size). Since November 3, 2021 there have been 6 separate hail days; the biggest stones in that time were 3.50 in on June 15, 2025.
Over the 20 years 2006–2025, Petroleum County logged 61 reports on 40 hail days, about 3.0 reports a year. That is about the same as the median Montana county (3.0 a year) and ranks #30 of 57 Montana counties for all-time reports. Petroleum County holds 1% of all 8,453 hail reports in Montana.
10% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Montana county. The largest hail on record here is 3.50 in (teacup) on June 15, 2025 near 6.75 SE Winnett.
Reports were up 54% in 2016–2025 (37) compared with 2006–2015 (24). The busiest year was 2000, with 17 reports on 7 days. Hail here peaks in July (41% of reports); 43% fall between April and June.
Reports a year 2006–2025 average
- Petroleum County 3.0
- Median Montana county 3.0
Hail days 2006–2025
- Petroleum County 40
- Median Montana county 31
Share 2 in or larger of sized reports
- Petroleum County 10%
- Median Montana county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 6 | 2 | 8 | ||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 1 | 1 | |||||||||||
| 2022 | 2 | 2 | |||||||||||
| 2021 | 1 | 3 | 4 | ||||||||||
| 2020 | 1 | 1 | 2 | ||||||||||
| 2019 | 2 | 3 | 5 | ||||||||||
| 2018 | 3 | 3 | |||||||||||
| 2017 | 1 | 1 | 2 | 4 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 17, 2025 | 2 | 2.00 in | — |
| Jun 15, 2025 | 5 | 3.50 in | — |
| Jun 13, 2025 | 1 | 1.00 in | — |
| Jul 29, 2023 | 1 | 1.00 in | — |
| Jul 14, 2022 | 1 | 1.00 in | — |
| Jul 4, 2022 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 15, 2025 | 3.50 inteacup | 6.75 SE Winnett | 17:46 local · NCEI |
| Jul 9, 2000 | 3.50 inteacup | Flatwillow | 15:07 local · NCEI |
| Jun 28, 1963 | 3.50 inteacup | — | 17:00 local · NCEI |
| Aug 11, 2019 | 3.00 inteacup | 8.2 ESE Winnett | 17:10 local · NCEI |
| Jun 15, 2025 | 2.50 intennis ball | 1.17 NE Winnett | 18:00 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 33%
- 1–2 in 65 57%
- 2 in + 11 10%
- No size 1
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 17, 2025 | 1.75 ingolf ball | 12.74 ESE Winnett | 19:50 local · NCEI |
| Jul 17, 2025 | 2.00 inhen egg | 5.84 NNE Flatwillow | 19:20 local · NCEI |
| Jun 15, 2025 | 2.50 intennis ball | 1.17 NE Winnett | 18:00 local · NCEI |
| Jun 15, 2025 | 1.50 inping pong ball | 6.13 E Winnett | 17:52 local · NCEI |
| Jun 15, 2025 | 3.50 inteacup | 6.75 SE Winnett | 17:46 local · NCEI |
| Jun 15, 2025 | 1.75 ingolf ball | 4.71 E Winnett | 17:45 local · NCEI |
| Jun 15, 2025 | 1.75 ingolf ball | 0.69 N Winnett | 17:39 local · NCEI |
| Jun 13, 2025 | 1.00 inquarter | 0.84 NW Winnett | 15:20 local · NCEI |
| Jul 29, 2023 | 1.00 inquarter | 5.53 S Winnett | 22:00 local · NCEI |
| Jul 14, 2022 | 1.00 inquarter | 2.51 SE Winnett | 18:25 local · NCEI |
| Jul 4, 2022 | 1.00 inquarter | Winnett | 19:45 local · NCEI |
| Aug 26, 2021 | 1.00 inquarter | 1.88 E Winnett | 16:50 local · NCEI |
Cities and towns in Petroleum County
| Place | Reports | Largest |
|---|---|---|
| Winnett | 24 | 2.50 in |
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 |
|---|---|---|---|
| Flat Willow Colony | 9 | 8 | Jul 8, 2013 |
Questions about hail in Petroleum County
How often does it hail in Petroleum County, Montana?
115 hail reports have been logged in Petroleum County since 1963. Over the 20 years 2006–2025 that averages 3.0 reports a year. That ranks #30 of 57 Montana counties by number of reports.
When is hail season in Petroleum County?
Most reports come in July, June, August. July alone accounts for 41% of all reports.
What is the largest hail recorded in Petroleum County?
3.50 in (teacup size) on June 15, 2025 near 6.75 SE Winnett. 10% of reports here were 2 inches or larger.
When did it last hail in Petroleum County?
The most recent report in this data is from July 17, 2025 (1.75 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Petroleum County had in the last five years?
6 separate days with hail reports since November 3, 2021, adding up to 11 reports. The most recent was July 17, 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.