Forest City, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 55.5 °F (high). Annual precipitation averages 45.7 Inches. Forest City 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 | 13.7 °F | 30.6 °F | 3.53 in. |
| February | 14.6 °F | 33.2 °F | 2.78 in. |
| March | 22.2 °F | 41.5 °F | 3.12 in. |
| April | 33.1 °F | 54.8 °F | 4.02 in. |
| May | 44.2 °F | 66.2 °F | 4.46 in. |
| June | 53.6 °F | 74.2 °F | 5.18 in. |
| July | 57.9 °F | 78.5 °F | 4.26 in. |
| August | 56.5 °F | 76.8 °F | 3.64 in. |
| September | 49.3 °F | 70.1 °F | 3.99 in. |
| October | 37.8 °F | 58.0 °F | 4.28 in. |
| November | 28.9 °F | 46.2 °F | 2.87 in. |
| December | 20.6 °F | 35.4 °F | 3.58 in. |
| Annual | 36 °F | 55.5 °F | 45.71 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |