Hail history for Dewey County, South Dakota
Every NOAA hail report filed in Dewey County since 1957, with preliminary National Weather Service reports to November 3, 2026.
Readout · Dewey County
- Last hail
- Aug 24, 2026
- 1.75 in, golf ball size · preliminary
- Hail days, last 5 years
- 16
- since Nov 3, 2021 · 25 reports
- Largest ever
- 4.00 in
- grapefruit · Jul 5, 2022
266 reports on 145 days since 1957 · #19 of 67 South Dakota counties
Hail map · Dewey County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Concerned about your roof after hail?
Send a request to Moxisync Labs for review. The latest hail report in Dewey County is from August 24, 2026. We’re building local roofer coverage. Submitting a request does not guarantee a quote or book an inspection.
Phone line opening soon
What the record says about Dewey County
The latest hail report in Dewey County is from August 24, 2026, 1.75 in (golf ball size). Since November 3, 2021 there have been 16 separate hail days; the biggest stones in that time were 4.00 in on July 5, 2022.
Over the 20 years 2006–2025, Dewey County logged 161 reports on 77 hail days, about 8.1 reports a year. That is 46% more than the median South Dakota county (5.5 a year) and ranks #19 of 67 South Dakota counties for all-time reports. Dewey County holds 2% of all 17,223 hail reports in South Dakota.
8% of reports with a size were 2 inches (hen egg) or larger, against 8% for the median South Dakota county. The largest hail on record here is 4.00 in (grapefruit) on July 5, 2022 near Promise.
Reports were down 23% in 2016–2025 (70) compared with 2006–2015 (91). The busiest year was 2008, with 25 reports on 9 days. Hail here peaks in July (35% of reports); 42% fall between April and June.
Reports a year 2006–2025 average
- Dewey County 8.1
- Median South Dakota county 5.5
Hail days 2006–2025
- Dewey County 77
- Median South Dakota county 54
Share 2 in or larger of sized reports
- Dewey County 8%
- Median South Dakota county 8%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 2 | 1 | 3 | ||||||||||
| 2025 | 1 | 2 | 3 | ||||||||||
| 2024 | 2 | 1 | 1 | 4 | |||||||||
| 2023 | 2 | 1 | 3 | ||||||||||
| 2022 | 2 | 1 | 4 | 5 | 12 | ||||||||
| 2021 | 3 | 3 | 4 | 1 | 11 | ||||||||
| 2020 | 1 | 8 | 9 | ||||||||||
| 2019 | 1 | 2 | 3 | ||||||||||
| 2018 | 9 | 2 | 11 | ||||||||||
| 2017 | 1 | 1 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Aug 24, 2026 | 1 | 1.75 in | View |
| Jun 3, 2026 | 2 | 1.00 in | — |
| Jul 26, 2025 | 1 | 1.50 in | — |
| Jul 14, 2025 | 1 | 1.00 in | — |
| Jun 15, 2025 | 1 | 1.00 in | — |
| Jul 29, 2024 | 1 | 0.88 in | — |
| Jun 7, 2024 | 1 | 1.00 in | — |
| May 19, 2024 | 2 | 1.00 in | — |
| Jul 30, 2023 | 1 | 1.00 in | — |
| Jun 20, 2023 | 2 | 1.00 in | — |
| Jul 21, 2022 | 1 | 1.00 in | — |
| Jul 5, 2022 | 4 | 4.00 in | — |
| Jun 24, 2022 | 3 | 1.25 in | — |
| Jun 23, 2022 | 1 | 1.75 in | — |
| May 12, 2022 | 1 | 1.00 in | — |
| Apr 22, 2022 | 2 | 2.00 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 5, 2022 | 4.00 ingrapefruit | Promise | 08:13 local · NCEI |
| Jul 5, 2022 | 4.00 ingrapefruit | 2.07 N Timber Lake | 07:37 local · NCEI |
| Jul 12, 1995 | 3.75 inteacup | Isabel | 22:30 local · NCEI |
| Jun 16, 1971 | 3.00 inteacup | — | 00:15 local · NCEI |
| Aug 26, 1998 | 2.75 inbaseball | 11 N Lantry | 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 77 29%
- 1–2 in 167 63%
- 2 in + 22 8%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Aug 24, 2026 | 1.75 ingolf ball | 7 WNW Swan Creek Rec Ar | 00:17 UTC · NWS prelim. |
| Jun 3, 2026 | 1.00 inquarter | 1.69 NE Whitehorse | 11:26 local · NCEI |
| Jun 3, 2026 | 1.00 inquarter | 11.89 NNW Parade | 10:54 local · NCEI |
| Jul 26, 2025 | 1.50 inping pong ball | 1.46 W Promise | 17:30 local · NCEI |
| Jul 14, 2025 | 1.00 inquarter | 0.48 W Timber Lake | 17:50 local · NCEI |
| Jun 15, 2025 | 1.00 inquarter | 0.48 E Glencross | 02:15 local · NCEI |
| Jul 29, 2024 | 0.88 innickel | 11.28 NE Bear Creek | 16:55 local · NCEI |
| Jun 7, 2024 | 1.00 inquarter | 0.69 S Timber Lake Arpt | 17:57 local · NCEI |
| May 19, 2024 | 1.00 inquarter | 1.61 ESE Whitehorse | 17:24 local · NCEI |
| May 19, 2024 | 1.00 inquarter | 1.61 ESE Whitehorse | 16:48 local · NCEI |
| Jul 30, 2023 | 1.00 inquarter | 0.48 E Glencross | 08:52 local · NCEI |
| Jun 20, 2023 | 1.00 inquarter | 2 WNW Promise | 18:52 local · NCEI |
Cities and towns in Dewey County
| Place | Reports | Largest |
|---|---|---|
| Isabel | 35 | 2.50 in |
| Timber Lake | 30 | 4.00 in |
| Eagle Butte | 15 | 2.75 in |
| North Eagle Butte | 13 | 1.50 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 |
|---|---|---|---|
| Green Grass | 9 | 8 | Jul 29, 2024 |
| Lantry | 9 | 7 | May 12, 2022 |
| La Plant | 6 | 6 | Jul 21, 2022 |
| Whitehorse | 4 | 3 | Jun 3, 2026 |
Questions about hail in Dewey County
How often does it hail in Dewey County, South Dakota?
266 hail reports have been logged in Dewey County since 1957. Over the 20 years 2006–2025 that averages 8.1 reports a year. That ranks #19 of 67 South Dakota counties by number of reports.
When is hail season in Dewey County?
Most reports come in July, June, August. July alone accounts for 35% of all reports.
What is the largest hail recorded in Dewey County?
4.00 in (grapefruit size) on July 5, 2022 near Promise. 8% of reports here were 2 inches or larger.
When did it last hail in Dewey County?
The most recent report in this data is from August 24, 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 Dewey County had in the last five years?
16 separate days with hail reports since November 3, 2021, adding up to 25 reports. The most recent was August 24, 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.