Chittenden, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.1 °F (low) to 53.8 °F (high). Annual precipitation averages 47.2 Inches. Chittenden is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.6 °F | 27.3 °F | 2.91 in. |
| February | 9.6 °F | 30.5 °F | 2.49 in. |
| March | 18.5 °F | 39.3 °F | 3.25 in. |
| April | 30.7 °F | 53.0 °F | 3.84 in. |
| May | 42.2 °F | 65.9 °F | 4.22 in. |
| June | 51.2 °F | 73.5 °F | 4.97 in. |
| July | 56.2 °F | 77.8 °F | 5.14 in. |
| August | 54.2 °F | 76.2 °F | 4.56 in. |
| September | 46.6 °F | 69.1 °F | 4.11 in. |
| October | 36.4 °F | 56.6 °F | 4.6 in. |
| November | 26.7 °F | 44.0 °F | 3.34 in. |
| December | 16.8 °F | 32.8 °F | 3.72 in. |
| Annual | 33.1 °F | 53.8 °F | 47.15 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°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 |