Forksville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37 °F (low) to 58.3 °F (high). Annual precipitation averages 45.5 Inches. Forksville 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.7 °F | 33.3 °F | 3.28 in. |
| February | 16.5 °F | 35.8 °F | 2.41 in. |
| March | 23.8 °F | 44.3 °F | 3.4 in. |
| April | 34.2 °F | 58.1 °F | 3.89 in. |
| May | 44.8 °F | 69.2 °F | 3.86 in. |
| June | 54.0 °F | 77.0 °F | 4.48 in. |
| July | 58.4 °F | 81.4 °F | 4.5 in. |
| August | 56.6 °F | 79.8 °F | 4.19 in. |
| September | 49.4 °F | 72.8 °F | 4.68 in. |
| October | 38.6 °F | 60.7 °F | 4.12 in. |
| November | 29.9 °F | 48.6 °F | 3.27 in. |
| December | 22.3 °F | 38.0 °F | 3.46 in. |
| Annual | 37 °F | 58.3 °F | 45.54 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |