Montgomery, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 11.7 °C (high). Annual precipitation averages 1280.9 Millimeters. Montgomery is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.6 °C | -3.9 °C | 88.9 mm |
| February | -13.6 °C | -2.3 °C | 74.42 mm |
| March | -7.9 °C | 2.8 °C | 86.87 mm |
| April | -0.2 °C | 11 °C | 96.27 mm |
| May | 6.4 °C | 18.7 °C | 110.74 mm |
| June | 11.3 °C | 23.4 °C | 123.19 mm |
| July | 13.8 °C | 25.7 °C | 133.86 mm |
| August | 12.9 °C | 24.9 °C | 124.21 mm |
| September | 8.9 °C | 20.9 °C | 111.51 mm |
| October | 2.9 °C | 13.5 °C | 127 mm |
| November | -3 °C | 6.2 °C | 98.04 mm |
| December | -9.5 °C | -0.3 °C | 105.92 mm |
| Annual | 0.6 °C | 11.7 °C | 1280.93 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |