Stockton Springs, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.4 °C (high). Annual precipitation averages 1225 Millimeters. Stockton Springs is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.1 °C | -1.7 °C | 97.79 mm |
| February | -11.2 °C | -0.2 °C | 82.04 mm |
| March | -5.8 °C | 4.2 °C | 101.85 mm |
| April | 0.3 °C | 10.9 °C | 109.98 mm |
| May | 6.1 °C | 17.5 °C | 95.5 mm |
| June | 11.2 °C | 22.4 °C | 105.66 mm |
| July | 14.7 °C | 25.7 °C | 82.04 mm |
| August | 14 °C | 25.3 °C | 83.57 mm |
| September | 9.9 °C | 21.1 °C | 98.3 mm |
| October | 4 °C | 14.1 °C | 133.6 mm |
| November | -1.2 °C | 7.7 °C | 116.33 mm |
| December | -7.4 °C | 1.7 °C | 118.36 mm |
| Annual | 1.9 °C | 12.4 °C | 1225.02 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |