| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 55d - Pre-Wisconsinan Drift Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 45113 - Clarksville, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 30 | 40 | 50 | 59 | 63 | 61 | 53 | 42 | 34 | 24 | 41 |
| Avg Max Temp (°F) | 36 | 40 | 51 | 63 | 73 | 81 | 85 | 83 | 77 | 65 | 52 | 41 | 62 |
| Avg Precip (In.) | 2.79 | 2.52 | 3.41 | 3.97 | 4.76 | 4.15 | 4.1 | 3.67 | 2.97 | 2.88 | 3.37 | 2.99 | 41.59 |