HailEvidence → hail history → Duncan, IA
Duncan, IA hail history
Every figure below is from the NOAA NCEI Storm Events Database — the official NWS record — counting events recorded within 10 miles of the Duncan city centroid, 1950 to present.
Hail by year — last 15 years
| Year | Hail events ≤ 10 mi | Largest hail |
|---|---|---|
| 2026 | 0 | — |
| 2025 | 7 | 1.50" (ping pong ball) |
| 2024 | 0 | — |
| 2023 | 5 | 2.00" (hen egg) |
| 2022 | 6 | 1.75" (golf ball) |
| 2021 | 1 | 0.88" (nickel) |
| 2020 | 0 | — |
| 2019 | 1 | 1.00" (quarter) |
| 2018 | 3 | 3.00" (tea cup) |
| 2017 | 2 | 1.75" (golf ball) |
| 2016 | 0 | — |
| 2015 | 1 | 1.25" (half dollar) |
| 2014 | 0 | — |
| 2013 | 11 | 1.75" (golf ball) |
| 2012 | 1 | 1.00" (quarter) |
Note: the current and prior year reflect the latest NCEI compile and grow as NWS finalizes reports; same-day activity appears on this site's storm-day pages before it reaches this table.
Wind and tornado record
- 87 thunderstorm-wind events, strongest 100 mph, most recent 2025-07-28.
- 18 tornado events, most recent 2025-07-28.
Most recent recorded events
| Date | Type | Magnitude | Distance |
|---|---|---|---|
| 2025-07-28 | Thunderstorm Wind | 64 mph | 5.2 mi |
| 2025-07-28 | Thunderstorm Wind | 64 mph | 9.9 mi |
| 2025-07-28 | Thunderstorm Wind | 58 mph | 5.7 mi |
| 2025-07-28 | Tornado | EFU | 8.8 mi |
| 2025-07-27 | Thunderstorm Wind | 66 mph | 7.6 mi |
| 2025-07-27 | Thunderstorm Wind | 67 mph | 5 mi |
| 2025-07-27 | Thunderstorm Wind | 64 mph | 4.2 mi |
| 2025-07-27 | Thunderstorm Wind | 62 mph | 5.3 mi |
| 2025-06-20 | Thunderstorm Wind | 62 mph | 7.6 mi |
| 2025-06-11 | Hail | 0.88" | 9.8 mi |
2025-07-28: “Emergency manager relayed trees down in Garner, some roads blocked.”
2025-07-28: “Personal Weather Station gust to 64 mph.”
2025-07-28: “Personal weather station gust to 58 mph.”
Disputing a claim at a Duncan address?
This page covers the city. A claim dispute needs the record around your address: every NWS-recorded event within 1, 3 and 10 miles, the disputed date highlighted, citations formatted for an insurance appeal.
Verify an address — $29source: NOAA NCEI Storm Events computed 2026-06-12