Hail in Union County, South Dakota
Radar recorded hail of 1 inch or larger in Union County on 34 days since October 2020. That is more than 66% of US counties. It ranks 51 of 66 in South Dakota.
The largest radar estimate was 3.7 inches on June 2, 2025. The most recent 1-inch day was October 8, 2026. Radar estimates and ground reports often differ, so see how they compare.
See the county center on the map
Days of 1-inch hail by year
| Year | Days |
|---|---|
| 2020 (from October) | 0 |
| 2021 | 5 |
| 2022 | 2 |
| 2023 | 7 |
| 2024 | 3 |
| 2025 | 10 |
| 2026 | 7 |
Largest hail days
| Storm day | Radar estimate |
|---|---|
| June 2, 2025 | 3.7 in |
| May 20, 2024 | 3.45 in |
| May 17, 2026 | 3.4 in |
| May 11, 2023 | 2.6 in |
| July 25, 2021 | 2.15 in |
| September 1, 2026 | 2.1 in |
Ground reports
Within this area, storm spotters and weather offices logged 18 hail reports since October 2020, and 24 tornadoes started here since 1950.
Figures cover a circle with the same land area as the county, centered on it, so edges are approximate.
Most hail days in South Dakota
- Pennington County: 168 days
- Custer County: 160 days
- Oglala Lakota County: 130 days
- Lawrence County: 124 days
- Meade County: 120 days
- Butte County: 115 days