Stockton Springs, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.4 °F (low) to 54.3 °F (high). Annual precipitation averages 48.2 Inches. 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 | 10.3 °F | 28.9 °F | 3.85 in. |
| February | 11.8 °F | 31.7 °F | 3.23 in. |
| March | 21.5 °F | 39.5 °F | 4.01 in. |
| April | 32.5 °F | 51.7 °F | 4.33 in. |
| May | 42.9 °F | 63.5 °F | 3.76 in. |
| June | 52.1 °F | 72.4 °F | 4.16 in. |
| July | 58.4 °F | 78.2 °F | 3.23 in. |
| August | 57.2 °F | 77.5 °F | 3.29 in. |
| September | 49.8 °F | 69.9 °F | 3.87 in. |
| October | 39.2 °F | 57.4 °F | 5.26 in. |
| November | 29.8 °F | 45.8 °F | 4.58 in. |
| December | 18.7 °F | 35.0 °F | 4.66 in. |
| Annual | 35.4 °F | 54.3 °F | 48.23 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |