Hail history for Kennebec, South Dakota
NOAA hail reports in and within about 5 km (3 miles) of Kennebec since 1957, with preliminary reports to November 3, 2026.
Readout · Kennebec
- Last hail
- Aug 3, 2025
- 1.25 in, half dollar size
- Hail days, last 5 years
- 1
- since Nov 3, 2021 · 1 report
- Largest ever
- 4.50 in
- softball · May 20, 1974
22 reports on 19 days since 1957 · #100 of 305 South Dakota places
Hail map · Kennebec
- 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 Kennebec
The latest hail report in and around Kennebec is from August 3, 2025, 1.25 in (half dollar size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 1.25 in on August 3, 2025.
Over the 20 years 2006–2025, Kennebec logged 6 reports on 6 hail days, about 0.3 reports a year. That is 33% less than the median South Dakota town on this site (0.5 a year) and ranks #100 of 305 South Dakota cities and towns on this site for all-time reports. Kennebec accounts for 9% of the 240 reports filed in Lyman County.
9% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median South Dakota town on this site. The largest hail on record here is 4.50 in (softball) on May 20, 1974.
The busiest year was 2010, with 2 reports on 2 days. Hail here peaks in May (36% of reports); 55% fall between April and June.
Reports a year 2006–2025 average
- Kennebec 0.3
- Lyman County 6.9
- Median South Dakota town on this site 0.5
Hail days 2006–2025
- Kennebec 6
- Lyman County 70
- Median South Dakota town on this site 7
Share 2 in or larger of sized reports
- Kennebec 9%
- Lyman County 9%
- Median South Dakota town on this site 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 1 | 1 | |||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 1 | 1 | |||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Aug 3, 2025 | 1 | 1.25 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| May 20, 1974 | 4.50 insoftball | — | Lyman | 15:30 local · NCEI |
| Apr 18, 1957 | 2.75 inbaseball | — | Lyman | 14:00 local · NCEI |
| Aug 6, 2018 | 1.75 ingolf ball | 0.5 E Kennebec | Lyman | 17:57 local · NCEI |
| Aug 11, 2002 | 1.75 ingolf ball | 3 SE Kennebec | Lyman | 19:15 local · NCEI |
| Sep 3, 2000 | 1.75 ingolf ball | 3 W Kennebec | Lyman | 17:00 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 5 23%
- 1–2 in 15 68%
- 2 in + 2 9%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Aug 3, 2025 | 1.25 inhalf dollar | 0.5 E Kennebec | Lyman | 19:15 local · NCEI |
| Aug 6, 2018 | 1.75 ingolf ball | 0.5 E Kennebec | Lyman | 17:57 local · NCEI |
| Sep 7, 2015 | 1.00 inquarter | 0.85 NE Kennebec | Lyman | 18:37 local · NCEI |
| May 5, 2012 | 1.00 inquarter | 0.5 E Kennebec | Lyman | 06:50 local · NCEI |
| Sep 22, 2010 | 1.00 inquarter | 3.14 SSE Kennebec | Lyman | 08:05 local · NCEI |
| May 24, 2010 | 1.00 inquarter | 3.72 NE Kennebec | Lyman | 13:10 local · NCEI |
| May 11, 2004 | 0.88 innickel | Kennebec | Lyman | 18:30 local · NCEI |
| May 11, 2004 | 0.75 inpenny | 10 E Presho | Lyman | 17:30 local · NCEI |
| Aug 11, 2002 | 1.75 ingolf ball | 3 SE Kennebec | Lyman | 19:15 local · NCEI |
| Sep 3, 2000 | 1.75 ingolf ball | 3 W Kennebec | Lyman | 17:00 local · NCEI |
| Jul 24, 2000 | 0.88 innickel | Kennebec | Lyman | 17:55 local · NCEI |
| May 9, 1999 | 0.88 innickel | Kennebec | Lyman | 20:40 local · NCEI |
Hail history near Kennebec
- Presho 16 km · 20
- Reliance 21 km · 11
- Lower Brule 29 km · 11
- Vivian 35 km · 11
- Fort Thompson 40 km · 15
- Ideal 41 km · 15
- Oacoma 41 km · 10
- Chamberlain 44 km · 42
Questions about hail in Kennebec
How often does it hail in Kennebec, South Dakota?
22 hail reports have been logged in and within about 5 km (3 miles) of Kennebec since 1957. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #100 of 305 South Dakota places by number of reports.
When is hail season in Kennebec?
Most reports come in May, August, June. May alone accounts for 36% of all reports.
What is the largest hail recorded in Kennebec?
4.50 in (softball size) on May 20, 1974. 9% of reports here were 2 inches or larger.
When did it last hail in Kennebec?
The most recent report in this data is from August 3, 2025 (1.25 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Kennebec had in the last five years?
1 separate days with hail reports since November 3, 2021, adding up to 1 reports. The most recent was August 3, 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.