| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 55d - Pre-Wisconsinan Drift Plains |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 47129 - Clarksville, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 28 | 36 | 45 | 55 | 64 | 68 | 66 | 59 | 47 | 38 | 29 | 47 |
| Avg Max Temp (°F) | 42 | 47 | 58 | 68 | 77 | 85 | 88 | 87 | 80 | 70 | 57 | 46 | 67 |
| Avg Precip (In.) | 3.2 | 3.08 | 4.28 | 4.1 | 4.73 | 3.93 | 4.13 | 3.48 | 3.14 | 2.79 | 3.72 | 3.77 | 44.36 |