West Falls, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.1 °C (low) to 15.7 °C (high). Annual precipitation averages 1069.3 Millimeters. West Falls is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | 1.6 °C | 70.61 mm |
| February | -7.4 °C | 3.1 °C | 56.9 mm |
| March | -3 °C | 7.8 °C | 80.01 mm |
| April | 2.7 °C | 15.3 °C | 91.69 mm |
| May | 8.4 °C | 21.6 °C | 92.71 mm |
| June | 13.6 °C | 26.2 °C | 111.25 mm |
| July | 15.9 °C | 28.8 °C | 112.27 mm |
| August | 15 °C | 27.7 °C | 104.9 mm |
| September | 11.2 °C | 23.8 °C | 101.09 mm |
| October | 4.9 °C | 17 °C | 99.06 mm |
| November | 0.1 °C | 10.5 °C | 71.37 mm |
| December | -4.3 °C | 4.6 °C | 77.47 mm |
| Annual | 4.1 °C | 15.7 °C | 1069.33 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |