| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F 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: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 50144 - Leon, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 26 | 37 | 49 | 58 | 63 | 61 | 51 | 40 | 27 | 16 | 38 |
| Avg Max Temp (°F) | 30 | 37 | 49 | 61 | 72 | 81 | 86 | 84 | 76 | 65 | 48 | 34 | 60 |
| Avg Precip (In.) | .96 | 1.19 | 2.31 | 3.58 | 4.74 | 4.41 | 4.66 | 4.08 | 4.03 | 2.97 | 2.41 | 1.34 | 36.66 |