Wells, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 13.6 °C (high). Annual precipitation averages 1272.8 Millimeters. Wells is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.9 °C | 0.5 °C | 93.73 mm |
| February | -8.2 °C | 1.7 °C | 90.42 mm |
| March | -4.2 °C | 6 °C | 116.59 mm |
| April | 1.3 °C | 12.6 °C | 116.08 mm |
| May | 7 °C | 18.3 °C | 97.03 mm |
| June | 12.3 °C | 23 °C | 113.28 mm |
| July | 15.7 °C | 26 °C | 95 mm |
| August | 15 °C | 25.7 °C | 92.46 mm |
| September | 10.9 °C | 21.7 °C | 105.16 mm |
| October | 5.1 °C | 15.1 °C | 130.81 mm |
| November | -0.1 °C | 9.3 °C | 105.41 mm |
| December | -5.2 °C | 3.6 °C | 116.84 mm |
| Annual | 3.4 °C | 13.6 °C | 1272.81 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |