| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| 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: | 47b - Des Moines Lobe |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 50548 - Humboldt, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 13 | 25 | 36 | 49 | 58 | 62 | 60 | 50 | 38 | 25 | 12 | 36 |
| Avg Max Temp (°F) | 25 | 31 | 44 | 59 | 72 | 81 | 84 | 81 | 75 | 62 | 43 | 29 | 57 |
| Avg Precip (In.) | .86 | .75 | 2.12 | 3.26 | 3.94 | 4.82 | 4.29 | 4.15 | 3.01 | 2.3 | 1.78 | 1.04 | 32.33 |