Chittenden, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.6 °C (low) to 12.1 °C (high). Annual precipitation averages 1197.6 Millimeters. 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 | -13 °C | -2.6 °C | 73.91 mm |
| February | -12.4 °C | -0.8 °C | 63.25 mm |
| March | -7.5 °C | 4.1 °C | 82.55 mm |
| April | -0.7 °C | 11.7 °C | 97.54 mm |
| May | 5.7 °C | 18.8 °C | 107.19 mm |
| June | 10.7 °C | 23.1 °C | 126.24 mm |
| July | 13.4 °C | 25.4 °C | 130.56 mm |
| August | 12.3 °C | 24.6 °C | 115.82 mm |
| September | 8.1 °C | 20.6 °C | 104.39 mm |
| October | 2.4 °C | 13.7 °C | 116.84 mm |
| November | -2.9 °C | 6.7 °C | 84.84 mm |
| December | -8.4 °C | 0.4 °C | 94.49 mm |
| Annual | 0.6 °C | 12.1 °C | 1197.62 mm |
| 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 : -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 |