Manchester, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.3 °C (low) to 13.2 °C (high). Annual precipitation averages 1340.1 Millimeters. Manchester 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 | -11.4 °C | -1 °C | 95.76 mm |
| February | -11.1 °C | 0.4 °C | 81.03 mm |
| March | -6.3 °C | 5.2 °C | 112.78 mm |
| April | 0.1 °C | 12.6 °C | 110.49 mm |
| May | 6.2 °C | 19.3 °C | 110.24 mm |
| June | 11.2 °C | 23.8 °C | 133.1 mm |
| July | 13.6 °C | 26.2 °C | 123.19 mm |
| August | 12.5 °C | 25.4 °C | 118.87 mm |
| September | 8.3 °C | 21.7 °C | 102.36 mm |
| October | 2.6 °C | 14.5 °C | 131.57 mm |
| November | -2.3 °C | 7.9 °C | 99.31 mm |
| December | -7.6 °C | 1.9 °C | 121.41 mm |
| Annual | 1.3 °C | 13.2 °C | 1340.11 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 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |