Wilmerding, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 17 °C (high). Annual precipitation averages 1056.1 Millimeters. Wilmerding 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 | -5.6 °C | 3.4 °C | 81.03 mm |
| February | -4.9 °C | 4.8 °C | 62.23 mm |
| March | -1.2 °C | 9.9 °C | 85.34 mm |
| April | 4.3 °C | 17.4 °C | 86.36 mm |
| May | 10.3 °C | 22.9 °C | 97.54 mm |
| June | 15.2 °C | 27.2 °C | 112.78 mm |
| July | 17.5 °C | 29.5 °C | 110.74 mm |
| August | 16.8 °C | 28.7 °C | 96.27 mm |
| September | 12.9 °C | 25.1 °C | 89.66 mm |
| October | 6.6 °C | 18.3 °C | 79.5 mm |
| November | 1.2 °C | 11.4 °C | 75.44 mm |
| December | -2.7 °C | 5.7 °C | 79.25 mm |
| Annual | 5.9 °C | 17 °C | 1056.14 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |