| 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: | 40a - Loess Flats and Till Plains |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 50140 - Lamoni, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 17 | 27 | 38 | 50 | 60 | 65 | 62 | 53 | 41 | 28 | 17 | 39 |
| Avg Max Temp (°F) | 31 | 37 | 49 | 61 | 72 | 82 | 87 | 85 | 77 | 65 | 48 | 35 | 61 |
| Avg Precip (In.) | .98 | 1.37 | 2.59 | 3.74 | 4.81 | 4.28 | 4.84 | 4.41 | 4.23 | 3.19 | 2.59 | 1.45 | 38.48 |