Glenburn, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.9 °C (low) to 14.6 °C (high). Annual precipitation averages 1138.2 Millimeters. Glenburn is located in USDA Plant Hardiness Zone 6a. 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 | -9.3 °C | 0.5 °C | 77.72 mm |
| February | -8.8 °C | 2 °C | 61.47 mm |
| March | -4.4 °C | 6.7 °C | 81.53 mm |
| April | 1.3 °C | 14.4 °C | 96.01 mm |
| May | 7.3 °C | 20.7 °C | 99.57 mm |
| June | 12.4 °C | 25.2 °C | 123.19 mm |
| July | 14.8 °C | 27.7 °C | 112.78 mm |
| August | 13.9 °C | 26.6 °C | 109.73 mm |
| September | 9.9 °C | 22.8 °C | 107.44 mm |
| October | 3.8 °C | 15.9 °C | 107.95 mm |
| November | -1.1 °C | 9.4 °C | 76.96 mm |
| December | -5.6 °C | 3.3 °C | 83.82 mm |
| Annual | 2.9 °C | 14.6 °C | 1138.17 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 6a : -23.3°C to -20.6°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 |