Glen Campbell, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 14.8 °C (high). Annual precipitation averages 1208.5 Millimeters. Glen Campbell is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 0.8 °C | 96.77 mm |
| February | -7.5 °C | 2.5 °C | 74.17 mm |
| March | -3.7 °C | 7.4 °C | 98.04 mm |
| April | 2.1 °C | 15.2 °C | 103.38 mm |
| May | 7.8 °C | 21 °C | 108.97 mm |
| June | 12.7 °C | 25.1 °C | 116.33 mm |
| July | 14.9 °C | 27.1 °C | 116.08 mm |
| August | 14.1 °C | 26.5 °C | 108.2 mm |
| September | 10.4 °C | 22.8 °C | 107.19 mm |
| October | 4.2 °C | 16.2 °C | 87.12 mm |
| November | -0.9 °C | 9.2 °C | 95.25 mm |
| December | -4.8 °C | 3.2 °C | 97.03 mm |
| Annual | 3.4 °C | 14.8 °C | 1208.53 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |