The most recent reported hail day was 2015-08-01 -- 11 years ago, with nothing reported since. Shannon County is hit in about half the years on record. The largest stone on record here is 4.25 inches and 4.2 times the National Weather Service's 1 inch severe criterion, reported on 2014-08-17 near Oglala.
Colored swath = NOAA MRMS radar-estimated hail size; dots = NOAA SPC reports in South Dakota. Radar-indicated, not a guarantee of damage.
The last hail here fell on 2015-08-01, around Batesland. A free SwathIQ account -- hand-reviewed, invite within 24-48h -- pulls Shannon County addresses inside a hail swath above your size threshold into a door-knock list you can export, scoped to your approved markets.
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See call-center options ->NOAA's Storm Prediction Center has logged 30 separate hail days here since 2010 -- 1.8 a year over 17 years of record. Those days carry 58 separate reports between them, two or three on a typical one. 11 of those 17 years produced none at all. One year dominates the record: 2011 alone produced 8 of the 30 days. The last five years have been quieter than the long run: 0 days since 2022, against 2.5 a year before that.
3 of the 30 days reached 2 inches or more -- 10%, or about one hail day in 10, the last on 2014-08-17. Those big days do not follow the county's usual calendar: most of them fall in August, not June. 13 of the 30 days reached golf-ball size, 1.75 inches or bigger.
Across the whole of South Dakota, see the South Dakota hail map and history.
Reports cluster nearest Oglala -- 11 of the county's 30 hail days -- then Pine Ridge (8), Kyle (7), Batesland (4) and Red Shirt (4). Beyond those, NOAA names Sharps Corner, Rockyford, Wounded Knee, Manderson and Porcupine on more than one hail day apiece.
| Place | Hail days since 2010 | Largest stone |
|---|---|---|
| 6 Nnw Kyle | 4 | 2.75″ |
| 1 S Oglala | 3 | 4.25″ |
| Oglala | 3 | 1.75″ |
| Pine Ridge | 3 | 1.75″ |
| 1 Nne Sharps Corner | 2 | 1.75″ |
The season runs June through August: 27 of the 30 hail days on record fall in those 3 months (90%). June is the single busiest month, with 14 of them (47%). That peak opens the window: the season starts at its worst and eases off from there. Hail has also been reported in May, outside that window. Reports span 4 of the 12 calendar months; the other 8 have never produced one.
| Month | Hail days |
|---|---|
| May | 3 |
| June | 14 |
| July | 6 |
| August | 7 |
That day put 2 reports on the map, the biggest 1.25 inches near Batesland. No hail day has been reported here yet this year.
| Date | Max hail | Reports |
|---|---|---|
| 2015-08-01 | 1.25″ | 2 |
| 2015-07-25 | 1.00″ | 1 |
| 2015-07-05 | 1.25″ | 1 |
| 2015-06-23 | 1.75″ | 2 |
| 2015-06-20 | 1.75″ | 8 |
| 2015-06-17 | 1.50″ | 2 |
| 2014-08-26 | 1.75″ | 4 |
| 2014-08-17 | 4.25″ | 3 |
The colored swath is NOAA's MRMS radar estimate of the largest hail per ~1 km cell; the dots are SPC ground reports. Yellow is about an inch, red 1.5 to 2″, purple 2″ and up (hail size vs roof damage). On this county's worst day the reports reached 4.25 inches, which is the purple band. Look up a street address with the hail history by address tool.
The nearest counties with a page of their own, over the state line included: Oglala Lakota County (53 hail days), Bennett County (50), Fall River County (94), Sheridan County, Nebraska (110) and Dawes County, Nebraska (61). Every one of them takes more hail than Shannon County.
Oglala Lakota County · Bennett County · Fall River County · Sheridan County, Nebraska · Dawes County, Nebraska
Back to the South Dakota hail map or the U.S. hail map.
Data & method: NOAA/NWS Storm Prediction Center reports + NOAA MRMS MESH radar, Shannon County, South Dakota only. Radar-indicated and observation-based -- informational only, not a guarantee of damage or a valid claim.