| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 47b - Des Moines Lobe |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 50010 - Ames, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 15 | 26 | 37 | 49 | 59 | 63 | 61 | 52 | 40 | 27 | 14 | 38 |
| Avg Max Temp (°F) | 27 | 33 | 46 | 60 | 72 | 81 | 84 | 82 | 75 | 63 | 45 | 31 | 58 |
| Avg Precip (In.) | .83 | .93 | 2.1 | 3.34 | 4.31 | 5.14 | 4.39 | 4.33 | 3.1 | 2.59 | 2.01 | 1.13 | 34.21 |