Wells River, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.4 °C (low) to 13.2 °C (high). Annual precipitation averages 966.2 Millimeters. Wells River is located in USDA Plant Hardiness Zone 4b. 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 | -14.3 °C | -2.4 °C | 60.96 mm |
| February | -14.1 °C | -0.2 °C | 50.29 mm |
| March | -8.3 °C | 4.9 °C | 62.23 mm |
| April | -0.9 °C | 12.3 °C | 72.64 mm |
| May | 5.7 °C | 19.7 °C | 89.92 mm |
| June | 10.8 °C | 24.3 °C | 97.54 mm |
| July | 13.9 °C | 27.3 °C | 100.08 mm |
| August | 12.8 °C | 26.6 °C | 100.33 mm |
| September | 8.6 °C | 22.3 °C | 91.69 mm |
| October | 2.2 °C | 14.6 °C | 100.58 mm |
| November | -2.9 °C | 7.6 °C | 68.07 mm |
| December | -9.1 °C | 0.9 °C | 71.88 mm |
| Annual | 0.4 °C | 13.2 °C | 966.21 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 4b : -31.7°C to -28.9°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 |