Hail history for Bison, South Dakota
NOAA hail reports in and within about 5 km (3 miles) of Bison since 1957, with preliminary reports to November 3, 2026.
Readout · Bison
- Last hail
- Aug 10, 2026
- 0.88 in, nickel size · preliminary
- Hail days, last 5 years
- 2
- since Nov 3, 2021 · 2 reports
- Largest ever
- 2.75 in
- baseball · Jul 30, 1970
17 reports on 17 days since 1957 · #153 of 305 South Dakota places
Hail map · Bison
- 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 Bison
The latest hail report in and around Bison is from August 10, 2026, 0.88 in (nickel size). Since November 3, 2021 there have been 2 separate hail days; the biggest stones in that time were 1.00 in on May 27, 2022.
Over the 20 years 2006–2025, Bison logged 5 reports on 5 hail days, about 0.3 reports a year. That is 44% less than the median South Dakota town on this site (0.5 a year) and ranks #153 of 305 South Dakota cities and towns on this site for all-time reports. Bison accounts for 5% of the 348 reports filed in Perkins County.
35% 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 2.75 in (baseball) on July 30, 1970.
The busiest year was 1957, with 2 reports on 2 days. Hail here peaks in July (41% of reports); 29% fall between April and June.
Reports a year 2006–2025 average
- Bison 0.3
- Perkins County 11.9
- Median South Dakota town on this site 0.5
Hail days 2006–2025
- Bison 5
- Perkins County 108
- Median South Dakota town on this site 7
Share 2 in or larger of sized reports
- Bison 35%
- Perkins County 12%
- 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 | 1 | 1 | |||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 1 | 1 | |||||||||||
| 2021 | 1 | 1 | |||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Aug 10, 2026 | 1 | 0.88 in | View |
| May 27, 2022 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 30, 1970 | 2.75 inbaseball | — | Perkins | 18:20 local · NCEI |
| Jul 10, 2016 | 2.25 inhen egg | 2.37 SSW Bison | Perkins | 17:50 local · NCEI |
| Jul 8, 2021 | 2.00 inhen egg | 1 N Bison | Perkins | 18:04 local · NCEI |
| Sep 1, 1990 | 2.00 inhen egg | — | Perkins | 17:35 local · NCEI |
| Jul 6, 1971 | 2.00 inhen egg | — | Perkins | 18:10 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 29%
- 1–2 in 6 35%
- 2 in + 6 35%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Aug 10, 2026 | 0.88 innickel | Bison | Perkins | 01:53 UTC · NWS prelim. |
| May 27, 2022 | 1.00 inquarter | 3 WNW Bison | Perkins | 16:30 local · NCEI |
| Jul 8, 2021 | 2.00 inhen egg | 1 N Bison | Perkins | 18:04 local · NCEI |
| Jul 31, 2020 | 0.88 innickel | Bison | Perkins | 13:10 local · NCEI |
| Jul 10, 2016 | 2.25 inhen egg | 2.37 SSW Bison | Perkins | 17:50 local · NCEI |
| May 24, 2010 | 1.00 inquarter | Bison | Perkins | 14:25 local · NCEI |
| Jun 21, 2005 | 0.88 innickel | Bison | Perkins | 08:15 local · NCEI |
| May 3, 2003 | 1.00 inquarter | Bison | Perkins | 16:00 local · NCEI |
| Jun 19, 2002 | 0.75 inpenny | 2 S Bison | Perkins | 01:00 local · NCEI |
| Sep 1, 1990 | 2.00 inhen egg | — | Perkins | 17:35 local · NCEI |
| Aug 10, 1975 | 1.50 inping pong ball | — | Perkins | 21:00 local · NCEI |
| Jul 6, 1971 | 2.00 inhen egg | — | Perkins | 18:10 local · NCEI |
Hail history near Bison
- Prairie City 27 km · 11
- Lemmon 52 km · 26
Questions about hail in Bison
How often does it hail in Bison, South Dakota?
17 hail reports have been logged in and within about 5 km (3 miles) of Bison since 1957. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #153 of 305 South Dakota places by number of reports.
When is hail season in Bison?
Most reports come in July, August, May. July alone accounts for 41% of all reports.
What is the largest hail recorded in Bison?
2.75 in (baseball size) on July 30, 1970. 35% of reports here were 2 inches or larger.
When did it last hail in Bison?
The most recent report in this data is from August 10, 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 Bison had in the last five years?
2 separate days with hail reports since November 3, 2021, adding up to 2 reports. The most recent was August 10, 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.