| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 47b - Des Moines Lobe |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 50311 - Des Moines, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 17 | 28 | 39 | 51 | 61 | 65 | 63 | 54 | 42 | 29 | 17 | 40 |
| Avg Max Temp (°F) | 29 | 35 | 47 | 61 | 72 | 81 | 85 | 83 | 76 | 64 | 47 | 33 | 59 |
| Avg Precip (In.) | .97 | 1.13 | 2.19 | 3.47 | 4.32 | 4.73 | 4.23 | 4.3 | 3.16 | 2.59 | 2.07 | 1.23 | 34.38 |