Glenfield, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.4 °C (low) to 16.8 °C (high). Annual precipitation averages 1019.3 Millimeters. Glenfield is located in USDA Plant Hardiness Zone 7a. 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 | -5.2 °C | 3.1 °C | 82.3 mm |
| February | -4.6 °C | 4.4 °C | 65.28 mm |
| March | -0.7 °C | 9.5 °C | 78.49 mm |
| April | 4.9 °C | 17.2 °C | 87.88 mm |
| May | 10.6 °C | 22.4 °C | 95 mm |
| June | 15.6 °C | 27.2 °C | 104.65 mm |
| July | 17.9 °C | 29.3 °C | 104.39 mm |
| August | 17.3 °C | 28.6 °C | 84.33 mm |
| September | 13.6 °C | 24.9 °C | 90.93 mm |
| October | 7.3 °C | 18.1 °C | 74.42 mm |
| November | 1.8 °C | 11.1 °C | 72.64 mm |
| December | -2.3 °C | 5.4 °C | 78.99 mm |
| Annual | 6.4 °C | 16.8 °C | 1019.3 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°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 |