Shapleigh, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.7 °F (low) to 56 °F (high). Annual precipitation averages 49.6 Inches. Shapleigh is located in USDA Plant Hardiness Zone 5b. 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 | 12.6 °F | 29.6 °F | 3.48 in. |
| February | 12.5 °F | 32.6 °F | 3.48 in. |
| March | 20.9 °F | 40.7 °F | 4.3 in. |
| April | 32.4 °F | 54.8 °F | 4.48 in. |
| May | 43.6 °F | 67.3 °F | 3.58 in. |
| June | 53.3 °F | 75.9 °F | 4.43 in. |
| July | 58.5 °F | 81.2 °F | 4.18 in. |
| August | 57.4 °F | 79.5 °F | 3.94 in. |
| September | 49.5 °F | 71.2 °F | 3.9 in. |
| October | 39.5 °F | 57.8 °F | 5.16 in. |
| November | 28.9 °F | 45.9 °F | 4.2 in. |
| December | 19.2 °F | 35.2 °F | 4.47 in. |
| Annual | 35.7 °F | 56 °F | 49.6 in. |
| 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |