Ferndale, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.4 °C (low) to 16.3 °C (high). Annual precipitation averages 1165.9 Millimeters. 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 | -6.9 °C | 2.4 °C | 81.53 mm |
| February | -6.1 °C | 4.1 °C | 76.45 mm |
| March | -2.3 °C | 8.8 °C | 93.73 mm |
| April | 3.4 °C | 16.9 °C | 103.12 mm |
| May | 8.9 °C | 22.3 °C | 109.22 mm |
| June | 13.6 °C | 26.6 °C | 113.54 mm |
| July | 15.7 °C | 28.7 °C | 110.49 mm |
| August | 14.7 °C | 27.9 °C | 110.74 mm |
| September | 11 °C | 24.4 °C | 104.39 mm |
| October | 4.6 °C | 17.8 °C | 86.87 mm |
| November | 0 °C | 10.7 °C | 82.3 mm |
| December | -3.9 °C | 4.9 °C | 93.47 mm |
| Annual | 4.4 °C | 16.3 °C | 1165.85 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |