Ferndale, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.9 °F (low) to 61.4 °F (high). Annual precipitation averages 45.9 Inches. Ferndale is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.5 °F | 36.4 °F | 3.21 in. |
| February | 21.0 °F | 39.3 °F | 3.01 in. |
| March | 27.9 °F | 47.9 °F | 3.69 in. |
| April | 38.2 °F | 62.5 °F | 4.06 in. |
| May | 48.1 °F | 72.2 °F | 4.3 in. |
| June | 56.4 °F | 79.8 °F | 4.47 in. |
| July | 60.3 °F | 83.7 °F | 4.35 in. |
| August | 58.5 °F | 82.3 °F | 4.36 in. |
| September | 51.8 °F | 75.9 °F | 4.11 in. |
| October | 40.2 °F | 64.1 °F | 3.42 in. |
| November | 32.0 °F | 51.3 °F | 3.24 in. |
| December | 24.9 °F | 40.9 °F | 3.68 in. |
| Annual | 39.9 °F | 61.4 °F | 45.9 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |