Forest Hills, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 16.6 °C (high). Annual precipitation averages 1052.6 Millimeters. Forest Hills 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 2.8 °C | 81.28 mm |
| February | -5.3 °C | 4.5 °C | 61.98 mm |
| March | -1.4 °C | 9.6 °C | 85.09 mm |
| April | 4.3 °C | 17.1 °C | 85.85 mm |
| May | 10.2 °C | 22.4 °C | 97.54 mm |
| June | 15.1 °C | 26.8 °C | 112.27 mm |
| July | 17.4 °C | 28.9 °C | 109.73 mm |
| August | 16.6 °C | 28.2 °C | 95.76 mm |
| September | 12.7 °C | 24.6 °C | 89.92 mm |
| October | 6.4 °C | 17.8 °C | 79.25 mm |
| November | 1 °C | 11.1 °C | 75.18 mm |
| December | -3 °C | 5.3 °C | 78.74 mm |
| Annual | 5.7 °C | 16.6 °C | 1052.59 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |