Hail history for Ismay, Montana
NOAA hail reports in and within about 5 km (3 miles) of Ismay since 1999, with preliminary reports to November 5, 2026.
Readout · Ismay
- Last hail
- Jul 28, 2025
- 1.00 in, quarter size
- Hail days, last 5 years
- 2
- since Nov 5, 2021 · 2 reports
- Largest ever
- 3.50 in
- teacup · Jun 17, 2014
11 reports on 8 days since 1999 · #92 of 111 Montana places
Hail map · Ismay
- 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 Ismay
The latest hail report in and around Ismay is from July 28, 2025, 1.00 in (quarter size). Since November 5, 2021 there have been 2 separate hail days; the biggest stones in that time were 1.00 in on July 28, 2025.
Over the 20 years 2006–2025, Ismay logged 7 reports on 5 hail days, about 0.3 reports a year. That is 22% less than the median Montana town on this site (0.5 a year) and ranks #92 of 111 Montana cities and towns on this site for all-time reports. Ismay accounts for 5% of the 239 reports filed in Custer County.
9% of reports with a size were 2 inches (hen egg) or larger, against 8% for the median Montana town on this site. The largest hail on record here is 3.50 in (teacup) on June 17, 2014 near 2.81 NW Ismay.
The busiest year was 2014, with 3 reports on 1 day. Hail here peaks in June (64% of reports); 73% fall between April and June.
Reports a year 2006–2025 average
- Ismay 0.3
- Custer County 6.5
- Median Montana town on this site 0.5
Hail days 2006–2025
- Ismay 5
- Custer County 55
- Median Montana town on this site 7
Share 2 in or larger of sized reports
- Ismay 9%
- Custer County 12%
- Median Montana town on this site 8%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 2 | 2 | |||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Hail days since Nov 5, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 28, 2025 | 1 | 1.00 in | — |
| Jul 25, 2025 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jun 17, 2014 | 3.50 inteacup | 2.81 NW Ismay | Custer | 12:30 local · NCEI |
| Jun 17, 2014 | 1.25 inhalf dollar | 3.11 NNE Ismay | Custer | 12:25 local · NCEI |
| Jun 30, 2010 | 1.25 inhalf dollar | 3.11 NNE Ismay | Custer | 19:00 local · NCEI |
| Jul 28, 2025 | 1.00 inquarter | 2.81 NW Ismay | Custer | 07:00 local · NCEI |
| Jul 25, 2025 | 1.00 inquarter | 2.81 NW Ismay | Custer | 16:03 local · NCEI |
Size of every report
- Under 1 in 4 36%
- 1–2 in 6 55%
- 2 in + 1 9%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 28, 2025 | 1.00 inquarter | 2.81 NW Ismay | Custer | 07:00 local · NCEI |
| Jul 25, 2025 | 1.00 inquarter | 2.81 NW Ismay | Custer | 16:03 local · NCEI |
| Jun 17, 2014 | 1.00 inquarter | 3.11 NNE Ismay | Custer | 15:10 local · NCEI |
| Jun 17, 2014 | 3.50 inteacup | 2.81 NW Ismay | Custer | 12:30 local · NCEI |
| Jun 17, 2014 | 1.25 inhalf dollar | 3.11 NNE Ismay | Custer | 12:25 local · NCEI |
| Jun 30, 2010 | 1.25 inhalf dollar | 3.11 NNE Ismay | Custer | 19:00 local · NCEI |
| Jun 14, 2006 | 0.75 inpenny | Ismay | Custer | 17:06 local · NCEI |
| Jul 11, 2004 | 1.00 inquarter | Ismay | Custer | 18:15 local · NCEI |
| Jun 27, 2001 | 0.88 innickel | Ismay | Custer | 14:00 local · NCEI |
| Jun 27, 2001 | 0.75 inpenny | Ismay | Custer | 13:55 local · NCEI |
| May 29, 1999 | 0.88 innickel | Ismay | Custer | 16:19 local · NCEI |
Hail history near Ismay
Questions about hail in Ismay
How often does it hail in Ismay, Montana?
11 hail reports have been logged in and within about 5 km (3 miles) of Ismay since 1999. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #92 of 111 Montana places by number of reports.
When is hail season in Ismay?
Most reports come in June, July, May. June alone accounts for 64% of all reports.
What is the largest hail recorded in Ismay?
3.50 in (teacup size) on June 17, 2014 near 2.81 NW Ismay. 9% of reports here were 2 inches or larger.
When did it last hail in Ismay?
The most recent report in this data is from July 28, 2025 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 5, 2026.
How many hail storms has Ismay had in the last five years?
2 separate days with hail reports since November 5, 2021, adding up to 2 reports. The most recent was July 28, 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.