Weston, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.1 °C (low) to 12 °C (high). Annual precipitation averages 1328.7 Millimeters. Weston 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 | -12.9 °C | -1.9 °C | 94.23 mm |
| February | -13.1 °C | -0.6 °C | 81.79 mm |
| March | -8.3 °C | 3.9 °C | 104.65 mm |
| April | -1.4 °C | 11.1 °C | 106.43 mm |
| May | 5.2 °C | 18.2 °C | 111 mm |
| June | 10.2 °C | 22.4 °C | 134.11 mm |
| July | 12.6 °C | 25.2 °C | 117.86 mm |
| August | 11.4 °C | 24.2 °C | 112.01 mm |
| September | 6.8 °C | 20.8 °C | 108.2 mm |
| October | 1.3 °C | 13.3 °C | 139.45 mm |
| November | -3.9 °C | 6.9 °C | 103.63 mm |
| December | -8.9 °C | 0.8 °C | 115.32 mm |
| Annual | -0.1 °C | 12 °C | 1328.68 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 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |