| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°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 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: | 47f - Rolling Loess Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 52732 - Clinton, IA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 16 | 27 | 39 | 50 | 60 | 64 | 62 | 53 | 42 | 30 | 18 | 39 |
| Avg Max Temp (°F) | 28 | 34 | 46 | 60 | 71 | 81 | 84 | 82 | 75 | 63 | 46 | 33 | 58 |
| Avg Precip (In.) | 1.38 | 1.31 | 2.41 | 3.41 | 3.98 | 4.48 | 3.51 | 4.52 | 3.13 | 2.66 | 2.54 | 1.86 | 35.18 |