| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 47c - Iowan Surface |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 50601 - Ackley, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 12 | 24 | 35 | 48 | 58 | 62 | 60 | 50 | 38 | 25 | 12 | 36 |
| Avg Max Temp (°F) | 25 | 31 | 44 | 58 | 71 | 81 | 84 | 81 | 74 | 62 | 43 | 29 | 57 |
| Avg Precip (In.) | .94 | .93 | 2.06 | 3.28 | 4.26 | 5.15 | 4.29 | 4.28 | 3.18 | 2.59 | 2.08 | 1.17 | 34.2 |