| 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 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: | 47f - Rolling Loess Prairies |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 51632 - Clarinda, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 16 | 26 | 38 | 50 | 59 | 64 | 61 | 51 | 39 | 27 | 16 | 38 |
| Avg Max Temp (°F) | 31 | 38 | 50 | 62 | 73 | 83 | 87 | 84 | 77 | 65 | 48 | 35 | 61 |
| Avg Precip (In.) | .91 | 1.02 | 2.43 | 3.32 | 4.77 | 4.67 | 5.11 | 4.21 | 3.93 | 2.67 | 2.32 | 1.16 | 36.53 |