3,529
Recorded events
96
Counties affected
0
Direct deaths
$1.6M
Property damage
Iowa heavy rain history: 3,529 recorded events across 96 counties between 1998 and 2025.
Decade by decade
Iowa heavy rain history by decade
The 2010s are the busiest decade on record with 2,556 reported heavy rain events across Iowa. Earlier decades are thinner because systematic reporting for this hazard expanded over time, not because the weather was calmer.
County ranking
Counties with the most heavy rain events in Iowa
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Polk County | 348 | 0 | $170K | 2007–2024 |
| #2 | Story County | 174 | 0 | $21K | 2008–2024 |
| #3 | Dallas County | 140 | 0 | $20K | 2007–2024 |
| #4 | Warren County | 122 | 0 | $12K | 2001–2025 |
| #5 | Webster County | 110 | 0 | $100K | 2007–2025 |
| #6 | Marion County | 107 | 0 | $0 | 2009–2025 |
| #7 | Appanoose County | 94 | 0 | $0 | 2007–2025 |
| #8 | Black Hawk County | 92 | 0 | $105K | 2008–2022 |
| #9 | Cass County | 82 | 0 | $0 | 2008–2024 |
| #10 | Clarke County | 81 | 0 | $0 | 2008–2025 |
| #11 | Cerro Gordo County | 76 | 0 | $0 | 2007–2024 |
| #12 | Wapello County | 76 | 0 | $45K | 2007–2024 |
| #13 | Boone County | 72 | 0 | $50K | 2007–2023 |
| #14 | Jasper County | 70 | 0 | $0 | 2009–2024 |
| #15 | Taylor County | 67 | 0 | $0 | 2008–2025 |
| #16 | Butler County | 66 | 0 | $0 | 2008–2024 |
| #17 | Poweshiek County | 63 | 0 | $0 | 2009–2025 |
| #18 | Kossuth County | 61 | 0 | $0 | 2008–2024 |
| #19 | Wayne County | 60 | 0 | $150K | 2007–2021 |
| #20 | Union County | 59 | 0 | $5K | 2008–2025 |
| #21 | Tama County | 56 | 0 | $0 | 2008–2024 |
| #22 | Ringgold County | 54 | 0 | $0 | 2008–2025 |
| #23 | Davis County | 51 | 0 | $10K | 2008–2022 |
| #24 | Grundy County | 50 | 0 | $0 | 2009–2025 |
| #25 | Marshall County | 50 | 0 | $0 | 2007–2025 |