| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 70b - Monongahela Transition Zone |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 15322 - Clarksville, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 28 | 36 | 47 | 56 | 61 | 59 | 52 | 40 | 32 | 24 | 39 |
| Avg Max Temp (°F) | 38 | 41 | 52 | 63 | 73 | 81 | 84 | 83 | 77 | 66 | 53 | 43 | 63 |
| Avg Precip (In.) | 2.86 | 2.49 | 3.48 | 3.34 | 4.09 | 3.87 | 4.11 | 3.81 | 3.33 | 2.57 | 3.21 | 2.86 | 40.02 |