Clintonville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.5 °F (low) to 58.8 °F (high). Annual precipitation averages 45.2 Inches. Clintonville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.1 °F | 33.6 °F | 3.29 in. |
| February | 18.2 °F | 36.6 °F | 2.54 in. |
| March | 25.2 °F | 45.8 °F | 3.36 in. |
| April | 36.1 °F | 58.9 °F | 4.0 in. |
| May | 46.8 °F | 69.7 °F | 3.91 in. |
| June | 55.5 °F | 77.6 °F | 4.98 in. |
| July | 59.3 °F | 81.4 °F | 4.78 in. |
| August | 57.9 °F | 80.2 °F | 3.97 in. |
| September | 51.1 °F | 73.7 °F | 4.12 in. |
| October | 40.4 °F | 61.3 °F | 3.45 in. |
| November | 31.4 °F | 49.0 °F | 3.36 in. |
| December | 23.4 °F | 38.1 °F | 3.39 in. |
| Annual | 38.5 °F | 58.8 °F | 45.15 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |