Chester, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 13.5 °C (high). Annual precipitation averages 1116.8 Millimeters. Chester is located in USDA Plant Hardiness Zone 5b. 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 | -12.3 °C | -1.3 °C | 76.71 mm |
| February | -11.8 °C | 0.5 °C | 64.01 mm |
| March | -6.8 °C | 5.1 °C | 81.03 mm |
| April | -0.2 °C | 12.7 °C | 92.96 mm |
| May | 6.1 °C | 19.7 °C | 94.74 mm |
| June | 11.3 °C | 24.4 °C | 104.39 mm |
| July | 14.1 °C | 27.3 °C | 102.36 mm |
| August | 13 °C | 26.4 °C | 97.54 mm |
| September | 8.7 °C | 22.5 °C | 92.96 mm |
| October | 2.4 °C | 14.8 °C | 122.68 mm |
| November | -2.6 °C | 7.9 °C | 87.63 mm |
| December | -7.8 °C | 1.7 °C | 99.82 mm |
| Annual | 1.2 °C | 13.5 °C | 1116.83 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |