Extreme rain in United States, 20 to 21 July 2026
Extreme rain in United States, 20 to 21 July 2026: 16 records at 16 stations, peak on 21 July 2026. Closed.
Data as of . Last revised (2026-10-17).
Key Facts
- Extreme rain in United States, 20 to 21 July 2026 set or tied 16 station records at 16 stations.
- It ran from 20 July 2026 to 21 July 2026 (2 days) and its peak day was 21 July 2026.
- Status: closed.
- Grundy Ctr set a daily record precipitation of 56.9 mm (2.2 in) on 21 July 2026.
- The busiest day was 21 July 2026 with 12 records.
- The oldest broken record in the ranked list had stood for 92 years.
Footprint
20 to 21 July 2026| Station | Type | Value | Date |
|---|---|---|---|
| Grundy Ctr | Record daily precipitation | 56.9 mm (2.2 in) | 2026-07-21 |
| Boone | Record daily precipitation | 66.3 mm (2.6 in) | 2026-07-21 |
| Ames 5 SE | Record daily precipitation | 100.3 mm (3.9 in) | 2026-07-21 |
| Ames 8 WSW | Record daily precipitation | 70.6 mm (2.8 in) | 2026-07-21 |
| Indianola 1SW | Record daily precipitation | 61.2 mm (2.4 in) | 2026-07-21 |
| Vinton | Record daily precipitation | 51.6 mm (2.0 in) | 2026-07-21 |
| Allison | Record daily precipitation | 66.0 mm (2.6 in) | 2026-07-21 |
| Des Moines Wsfo-Johnston | Record daily precipitation | 74.7 mm (2.9 in) | 2026-07-20 |
| Allerton | Record daily precipitation | 53.3 mm (2.1 in) | 2026-07-21 |
| Iowa City Muni AP | Record daily precipitation | 44.2 mm (1.7 in) | 2026-07-20 |
| Clutier | Record daily precipitation | 37.3 mm (1.5 in) | 2026-07-21 |
| Lowden | Record daily precipitation | 60.7 mm (2.4 in) | 2026-07-20 |
| Garwin | Record daily precipitation | 29.2 mm (1.1 in) | 2026-07-21 |
| Iowa Falls | Record daily precipitation | 27.7 mm (1.1 in) | 2026-07-21 |
| Waterloo Muni AP | Record daily precipitation | 50.5 mm (2.0 in) | 2026-07-20 |
| Rathbun Dam | Record daily precipitation | 33.5 mm (1.3 in) | 2026-07-21 |
Records per Day
Peak day 12| Date | Records |
|---|---|
| 2026-07-20 | 4 |
| 2026-07-21 | 12 |
Top Records by Margin
Margin over the record replaced| Ames 5 SE, 07-21 | |
|---|---|
| Ames 8 WSW, 07-21 | |
| Des Moines Wsfo-Johnston, 07-20 | |
| Grundy Ctr, 07-21 | |
| Lowden, 07-20 | |
| Clutier, 07-21 | |
| Boone, 07-21 | |
| Allerton, 07-21 | |
| Indianola 1SW, 07-21 | |
| Vinton, 07-21 | |
| Garwin, 07-21 | |
| Allison, 07-21 | |
| Iowa City Muni AP, 07-20 | |
| Rathbun Dam, 07-21 | |
| Waterloo Muni AP, 07-20 |
Margin is how far the new value is beyond the record it replaced. Ties are not shown.
Margin Against Age of the Broken Record
| Margin (mm) | Years the old record stood |
|---|---|
| 26 | 85 |
| 17 | 92 |
| 68 | 8 |
| 46 | 17 |
| 15 | 49 |
| 15 | 20 |
| 11 | 27 |
| 31 | 0 |
| 17 | 5 |
| 20 | 8 |
| 7 | 23 |
| 21 | 9 |
| 12 | 17 |
| 1 | 23 |
| 2 | 27 |
| 3 | 29 |
Compared With Other Events
Station records per event| Extreme rain in United States and Mexico, 23 February to 15 March 2019 | |
|---|---|
| Extreme rain in United States, 3 to 19 January 2024 | |
| Extreme rain in Australia, 7 to 26 March 2021 | |
| Extreme rain in United States and Mexico, 29 September to 19 October 2018 | |
| Extreme rain in United States, 19 December 2022 to 13 January 2023 | |
| Extreme rain in United States, 20 to 21 July 2026 (this event) |
Every Record Set
16 of 16| Date | Station | Record | Value | Margin | Years stood | Significance |
|---|---|---|---|---|---|---|
| 2026-07-20 | Des Moines Wsfo-Johnston | Record daily precipitation | 74.7 mm (2.9 in) | 31.3 mm (1.2 in) | 0 | 22 of 100 (Routine) |
| 2026-07-20 | Iowa City Muni AP | Record daily precipitation | 44.2 mm (1.7 in) | 7.4 mm (0.29 in) | 23 | 18 of 100 (Routine) |
| 2026-07-20 | Lowden | Record daily precipitation | 60.7 mm (2.4 in) | 20.8 mm (0.8 in) | 9 | 17 of 100 (Routine) |
| 2026-07-20 | Waterloo Muni AP | Record daily precipitation | 50.5 mm (2.0 in) | 1.5 mm (0.06 in) | 27 | 15 of 100 (Routine) |
| 2026-07-21 | Grundy Ctr | Record daily precipitation | 56.9 mm (2.2 in) | 26.2 mm (1.0 in) | 85 | 52 of 100 (Notable) |
| 2026-07-21 | Boone | Record daily precipitation | 66.3 mm (2.6 in) | 17.3 mm (0.7 in) | 92 | 48 of 100 (Notable) |
| 2026-07-21 | Ames 5 SE | Record daily precipitation | 100.3 mm (3.9 in) | 67.5 mm (2.7 in) | 8 | 46 of 100 (Notable) |
| 2026-07-21 | Ames 8 WSW | Record daily precipitation | 70.6 mm (2.8 in) | 45.7 mm (1.8 in) | 17 | 42 of 100 (Notable) |
| 2026-07-21 | Indianola 1SW | Record daily precipitation | 61.2 mm (2.4 in) | 15.0 mm (0.6 in) | 49 | 33 of 100 (Routine) |
| 2026-07-21 | Vinton | Record daily precipitation | 51.6 mm (2.0 in) | 14.8 mm (0.6 in) | 20 | 27 of 100 (Routine) |
| 2026-07-21 | Allison | Record daily precipitation | 66.0 mm (2.6 in) | 10.9 mm (0.4 in) | 27 | 24 of 100 (Routine) |
| 2026-07-21 | Allerton | Record daily precipitation | 53.3 mm (2.1 in) | 16.5 mm (0.6 in) | 5 | 20 of 100 (Routine) |
| 2026-07-21 | Clutier | Record daily precipitation | 37.3 mm (1.5 in) | 19.8 mm (0.8 in) | 8 | 18 of 100 (Routine) |
| 2026-07-21 | Garwin | Record daily precipitation | 29.2 mm (1.1 in) | 12.2 mm (0.5 in) | 17 | 16 of 100 (Routine) |
| 2026-07-21 | Iowa Falls | Record daily precipitation | 27.7 mm (1.1 in) | 0.5 mm (0.02 in) | 23 | 16 of 100 (Routine) |
| 2026-07-21 | Rathbun Dam | Record daily precipitation | 33.5 mm (1.3 in) | 3.0 mm (0.12 in) | 29 | 14 of 100 (Routine) |
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Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.