Troy, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.3 °C (low) to 11.6 °C (high). Annual precipitation averages 1236 Millimeters. Troy 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 | -14.9 °C | -4 °C | 84.07 mm |
| February | -14.1 °C | -2.3 °C | 75.18 mm |
| March | -8.4 °C | 2.8 °C | 79.5 mm |
| April | -0.5 °C | 10.8 °C | 101.35 mm |
| May | 6 °C | 18.5 °C | 108.97 mm |
| June | 10.9 °C | 23.3 °C | 120.9 mm |
| July | 13.6 °C | 25.7 °C | 120.9 mm |
| August | 12.7 °C | 24.8 °C | 112.01 mm |
| September | 8.6 °C | 20.7 °C | 96.01 mm |
| October | 2.7 °C | 13.3 °C | 129.54 mm |
| November | -3.1 °C | 6 °C | 108.97 mm |
| December | -9.6 °C | -0.4 °C | 98.55 mm |
| Annual | 0.3 °C | 11.6 °C | 1235.95 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 |