| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F 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. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 47m - Western Loess Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 51503 - Council Bluffs, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 27 | 39 | 50 | 60 | 65 | 62 | 53 | 40 | 27 | 16 | 39 |
| Avg Max Temp (°F) | 31 | 38 | 50 | 63 | 74 | 83 | 87 | 85 | 77 | 65 | 48 | 35 | 61 |
| Avg Precip (In.) | .77 | .79 | 2.14 | 3.01 | 4.49 | 4 | 3.92 | 3.3 | 3.2 | 2.27 | 1.8 | .96 | 30.64 |