Waterbury, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.8 °F (low) to 55.2 °F (high). Annual precipitation averages 44.7 Inches. Waterbury is located in USDA Plant Hardiness Zone 4b. 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 | 6.0 °F | 26.9 °F | 2.86 in. |
| February | 6.5 °F | 30.4 °F | 2.44 in. |
| March | 17.2 °F | 39.5 °F | 3.17 in. |
| April | 31.0 °F | 53.4 °F | 3.6 in. |
| May | 42.6 °F | 67.4 °F | 3.98 in. |
| June | 52.1 °F | 76.2 °F | 4.79 in. |
| July | 57.1 °F | 81.2 °F | 4.54 in. |
| August | 55.1 °F | 79.7 °F | 4.48 in. |
| September | 47.9 °F | 72.2 °F | 3.88 in. |
| October | 36.3 °F | 58.0 °F | 4.29 in. |
| November | 26.4 °F | 45.0 °F | 3.13 in. |
| December | 15.1 °F | 32.5 °F | 3.54 in. |
| Annual | 32.8 °F | 55.2 °F | 44.7 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |