Glen, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.9 °C (low) to 14.1 °C (high). Annual precipitation averages 1063 Millimeters. Glen is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.2 °C | -0.7 °C | 75.44 mm |
| February | -9.6 °C | 0.9 °C | 62.48 mm |
| March | -5.1 °C | 5.7 °C | 81.53 mm |
| April | 1.5 °C | 13.9 °C | 86.61 mm |
| May | 7.8 °C | 20.4 °C | 87.63 mm |
| June | 12.7 °C | 24.9 °C | 111 mm |
| July | 15.6 °C | 27.7 °C | 108.46 mm |
| August | 14.6 °C | 26.7 °C | 101.35 mm |
| September | 10.5 °C | 22.8 °C | 87.63 mm |
| October | 4.2 °C | 15.9 °C | 99.31 mm |
| November | -1.5 °C | 8.6 °C | 77.98 mm |
| December | -6.3 °C | 2.3 °C | 83.57 mm |
| Annual | 2.9 °C | 14.1 °C | 1062.99 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |