Hail history for Lyman County, South Dakota
Every NOAA hail report filed in Lyman County since 1957, with preliminary National Weather Service reports to November 3, 2026.
Readout · Lyman County
- Last hail
- Jul 4, 2026
- 0.88 in, nickel size
- Hail days, last 5 years
- 15
- since Nov 3, 2021 · 23 reports
- Largest ever
- 8.00 in
- softball · Jul 23, 2010
240 reports on 136 days since 1957 · #24 of 67 South Dakota counties
Hail map · Lyman 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 Lyman County
The latest hail report in Lyman County is from July 4, 2026, 0.88 in (nickel size). Since November 3, 2021 there have been 15 separate hail days; the biggest stones in that time were 2.50 in on July 9, 2025.
Over the 20 years 2006–2025, Lyman County logged 138 reports on 70 hail days, about 6.9 reports a year. That is 25% more than the median South Dakota county (5.5 a year) and ranks #24 of 67 South Dakota counties for all-time reports. Lyman County holds 1% of all 17,223 hail reports in South Dakota.
9% 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 8.00 in (softball) on July 23, 2010 near Vivian, which ties or sets the South Dakota record.
Reports held about level in 2016–2025 (67) compared with 2006–2015 (71). The busiest year was 2008, with 17 reports on 7 days. Hail here peaks in July (30% of reports); 43% fall between April and June.
Reports a year 2006–2025 average
- Lyman County 6.9
- Median South Dakota county 5.5
Hail days 2006–2025
- Lyman County 70
- Median South Dakota county 54
Share 2 in or larger of sized reports
- Lyman County 9%
- Median South Dakota county 8%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 3 | 3 | 6 | ||||||||||
| 2025 | 1 | 3 | 3 | 7 | |||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 1 | 2 | 1 | 4 | |||||||||
| 2022 | 6 | 6 | |||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 6 | 6 | |||||||||||
| 2019 | 1 | 4 | 5 | 1 | 11 | ||||||||
| 2018 | 1 | 7 | 4 | 4 | 16 | ||||||||
| 2017 | 5 | 6 | 11 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 4, 2026 | 3 | 1.25 in | — |
| Jun 3, 2026 | 2 | 1.75 in | — |
| Jun 2, 2026 | 1 | 1.75 in | — |
| Aug 13, 2025 | 1 | 1.00 in | — |
| Aug 3, 2025 | 2 | 1.25 in | — |
| Jul 29, 2025 | 1 | 1.00 in | — |
| Jul 28, 2025 | 1 | 1.75 in | — |
| Jul 9, 2025 | 1 | 2.50 in | — |
| Jun 27, 2025 | 1 | 1.00 in | — |
| Aug 4, 2023 | 1 | 1.25 in | — |
| Jul 18, 2023 | 2 | 1.50 in | — |
| Jun 23, 2023 | 1 | 1.25 in | — |
| May 29, 2022 | 1 | 1.00 in | — |
| May 12, 2022 | 2 | 1.75 in | — |
| May 11, 2022 | 3 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| Jul 23, 2010 | 8.00 insoftball | Vivian | —5 injured | 17:05 local · NCEI |
| Jun 11, 2003 | 4.50 insoftball | 10 NE Presho | — | 19:17 local · NCEI |
| May 20, 1974 | 4.50 insoftball | — | — | 15:30 local · NCEI |
| Jul 23, 2010 | 4.25 ingrapefruit | 0.76 NW Vivian | — | 17:10 local · NCEI |
| Aug 27, 2018 | 3.50 inteacup | 0.85 NW Presho | — | 18:55 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 63 26%
- 1–2 in 155 65%
- 2 in + 22 9%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 4, 2026 | 0.88 innickel | 0.5 W Oacoma | 17:58 local · NCEI |
| Jul 4, 2026 | 1.00 inquarter | 0.5 E Oacoma | 17:55 local · NCEI |
| Jul 4, 2026 | 1.25 inhalf dollar | 3.64 NE Oacoma | 17:37 local · NCEI |
| Jun 3, 2026 | 1.75 ingolf ball | 4.46 NW Iona | 19:10 local · NCEI |
| Jun 3, 2026 | 1.50 inping pong ball | 7.69 SW Presho | 17:26 local · NCEI |
| Jun 2, 2026 | 1.75 ingolf ball | 6.93 S Lower Brule | 21:50 local · NCEI |
| Aug 13, 2025 | 1.00 inquarter | 10.41 S Vivian | 19:21 local · NCEI |
| Aug 3, 2025 | 1.25 inhalf dollar | 0.5 E Kennebec | 19:15 local · NCEI |
| Aug 3, 2025 | 1.00 inquarter | 8.99 SW Oacoma | 18:37 local · NCEI |
| Jul 29, 2025 | 1.00 inquarter | 5.06 SSW Reliance Arpt | 15:51 local · NCEI |
| Jul 28, 2025 | 1.75 ingolf ball | 4.05 WSW Lower Brule | 17:50 local · NCEI |
| Jul 9, 2025 | 2.50 intennis ball | Lyman | 18:59 local · NCEI |
Cities and towns in Lyman 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 |
|---|---|---|---|
| West Brule | 4 | 4 | Jul 28, 2025 |
Questions about hail in Lyman County
How often does it hail in Lyman County, South Dakota?
240 hail reports have been logged in Lyman County since 1957. Over the 20 years 2006–2025 that averages 6.9 reports a year. That ranks #24 of 67 South Dakota counties by number of reports.
When is hail season in Lyman County?
Most reports come in July, June, August. July alone accounts for 30% of all reports.
What is the largest hail recorded in Lyman County?
8.00 in (softball size) on July 23, 2010 near Vivian. 9% of reports here were 2 inches or larger.
When did it last hail in Lyman County?
The most recent report in this data is from July 4, 2026 (0.88 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Lyman County had in the last five years?
15 separate days with hail reports since November 3, 2021, adding up to 23 reports. The most recent was July 4, 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.