| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F 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: | 47d - Missouri Alluvial Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 51510 - Carter Lake, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 18 | 28 | 39 | 51 | 61 | 66 | 63 | 54 | 41 | 28 | 16 | 40 |
| Avg Max Temp (°F) | 32 | 38 | 50 | 63 | 74 | 83 | 87 | 85 | 77 | 65 | 48 | 35 | 61 |
| Avg Precip (In.) | .78 | .78 | 2.14 | 2.97 | 4.45 | 3.94 | 3.85 | 3.24 | 3.18 | 2.25 | 1.79 | .93 | 30.3 |