Glenmont, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.1 °C (low) to 15.9 °C (high). Annual precipitation averages 1053.4 Millimeters. Glenmont is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 1.6 °C | 78.99 mm |
| February | -6.9 °C | 3.3 °C | 61.21 mm |
| March | -2.6 °C | 8.8 °C | 81.03 mm |
| April | 2.9 °C | 16.3 °C | 97.54 mm |
| May | 8.8 °C | 21.8 °C | 108.97 mm |
| June | 14.1 °C | 26.6 °C | 124.71 mm |
| July | 15.9 °C | 28.4 °C | 103.89 mm |
| August | 14.9 °C | 27.7 °C | 91.44 mm |
| September | 10.7 °C | 24.3 °C | 83.06 mm |
| October | 4.4 °C | 17.7 °C | 74.68 mm |
| November | -0.6 °C | 10.4 °C | 72.9 mm |
| December | -4.7 °C | 4.2 °C | 74.93 mm |
| Annual | 4.1 °C | 15.9 °C | 1053.35 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |