Tunbridge, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 13.1 °C (high). Annual precipitation averages 999.2 Millimeters. Tunbridge is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.9 °C | -2 °C | 66.55 mm |
| February | -13.4 °C | -0.2 °C | 53.09 mm |
| March | -8.1 °C | 4.5 °C | 70.1 mm |
| April | -1.2 °C | 12.3 °C | 78.49 mm |
| May | 5.3 °C | 19.8 °C | 84.58 mm |
| June | 10.4 °C | 24.5 °C | 104.65 mm |
| July | 13.3 °C | 27.1 °C | 109.47 mm |
| August | 12.3 °C | 26.1 °C | 94.74 mm |
| September | 8.2 °C | 22.2 °C | 83.06 mm |
| October | 2.1 °C | 14.6 °C | 100.33 mm |
| November | -3.3 °C | 7.4 °C | 72.64 mm |
| December | -9.1 °C | 0.9 °C | 81.53 mm |
| Annual | 0.2 °C | 13.1 °C | 999.23 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |