NOAA Storm Events · August 2017
Hail in August 2017: 769 NOAA reports across 38 states
NOAA logged 769 hail reports in August 2017, in 358 counties across 38 states. South Dakota had the most (128). The largest stone was 4.25 inches (a grapefruit), near Medicine Lodge in Barber County, Kansas, on August 9, 2017. The worst day was August 10, 2017, with 92 reports in 10 states.
- Where
- 358 counties in 38 states; South Dakota had 17% of the reports
- Largest stone
- 4.25 inches, a grapefruit, in Barber County, KS (near Medicine Lodge), on August 9, 2017
- Worst day
- August 10, 2017: 92 reports in 10 states, 12% of the month
- Days with hail
- 31 of 31 days had at least one report
- under 1 in
- 1 to 1.74 in
- 1.75 to 2.74 in
- 2.75 in and up
Day by day
August 10, 2017 was the worst day with 92 reports. A day with hail averaged 25.
| August 1 | 26 |
|---|---|
| August 2 | 67 |
| August 3 | 24 |
| August 4 | 13 |
| August 5 | 22 |
| August 6 | 7 |
| August 7 | 3 |
| August 8 | 10 |
| August 9 | 31 |
| August 10 | 92 |
| August 11 | 13 |
| August 12 | 61 |
| August 13 | 57 |
| August 14 | 54 |
| August 15 | 32 |
| August 16 | 15 |
| August 17 | 11 |
| August 18 | 52 |
| August 19 | 40 |
| August 20 | 5 |
| August 21 | 34 |
| August 22 | 10 |
| August 23 | 2 |
| August 24 | 7 |
| August 25 | 11 |
| August 26 | 46 |
| August 27 | 15 |
| August 28 | 3 |
| August 29 | 2 |
| August 30 | 3 |
| August 31 | 1 |
Where it hit hardest
Ranked by NOAA hail reports. A report is one spotter or sensor entry for one county and storm, so counts follow where people live as well as where hail fell.
| SD | 128 |
|---|---|
| NE | 124 |
| KS | 87 |
| CO | 75 |
| NM | 34 |
| IA | 32 |
| WI | 31 |
| OH | 26 |
| MI | 21 |
| NY | 21 |
| # | State | Reports | Share | Largest |
|---|---|---|---|---|
| 1 | South Dakota | 128 | 16.6% | 2.75 in |
| 2 | Nebraska | 124 | 16.1% | 3 in |
| 3 | Kansas | 87 | 11.3% | 4.25 in |
| 4 | Colorado | 75 | 9.8% | 3 in |
| 5 | New Mexico | 34 | 4.4% | 2.75 in |
| 6 | Iowa | 32 | 4.2% | 1.75 in |
| 7 | Wisconsin | 31 | 4.0% | 1.5 in |
| 8 | Ohio | 26 | 3.4% | 1.75 in |
| 9 | Michigan | 21 | 2.7% | 1.75 in |
| 10 | New York | 21 | 2.7% | 1.75 in |
| # | County | Reports | Largest |
|---|---|---|---|
| 1 | Custer County, NE | 20 | 3 in |
| 2 | Pennington County, SD | 20 | 1.75 in |
| 3 | Meade County, SD | 11 | 1.75 in |
| 4 | Tripp County, SD | 11 | 1.75 in |
| 5 | Union County, NM | 11 | 1.75 in |
| 6 | Washington County, CO | 11 | 2 in |
| 7 | Prowers County, CO | 9 | 3 in |
| 8 | San Miguel County, NM | 9 | 2.75 in |
| 9 | Butler County, KS | 7 | 1.25 in |
| 10 | Licking County, OH | 7 | 1 in |
County names link to the full hail history where we have published that county. The CSV below lists all 358 counties and all 38 states.
How August 2017 compares
| Compared with | Reports | August 2017 was |
|---|---|---|
| July 2017 | 1,064 | -295 (-28%) |
| August 2016 | 568 | +201 (+35%) |
| the average August in the other 11 years | 786 | -17 (-2%) |
August 2017 was the 6th busiest August of the 12 in the record and the 59th busiest of all 150 months.
| 2014 | 768 |
|---|---|
| 2015 | 1022 |
| 2016 | 568 |
| 2017 | 769 |
| 2018 | 863 |
| 2019 | 1287 |
| 2020 | 974 |
| 2021 | 735 |
| 2022 | 378 |
| 2023 | 920 |
| 2024 | 636 |
| 2025 | 494 |
Every August in the record, 2014 to 2025. Months after June 2026 are not in NOAA's file yet.
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Download the data
Source: NOAA NCEI Storm Events Database, hail rows at county level, data through June 2026. Reports are preliminary and unverified: they show that hail was reported in a county, not that a given roof was damaged. Method: how we count. More: State of Hail by year · county hail history · press.
Source: NOAA Storm Events Database, public domain. Counts and tables on this page are free to reuse with credit to PickARoofer under CC BY 4.0.