| 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: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 47e - Steeply Rolling Loess Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 51601 - Shenandoah, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 17 | 28 | 40 | 51 | 61 | 65 | 63 | 53 | 41 | 28 | 17 | 39 |
| Avg Max Temp (°F) | 31 | 38 | 50 | 63 | 74 | 83 | 87 | 85 | 78 | 66 | 48 | 35 | 62 |
| Avg Precip (In.) | .8 | .93 | 2.32 | 3.26 | 4.53 | 4.46 | 4.65 | 3.8 | 3.5 | 2.5 | 2.13 | 1.13 | 34.03 |