Boothbay, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40 °F (low) to 53 °F (high). Annual precipitation averages 49.5 Inches. Boothbay is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.7 °F | 32.5 °F | 3.94 in. |
| February | 20.8 °F | 34.1 °F | 3.68 in. |
| March | 27.1 °F | 39.5 °F | 4.51 in. |
| April | 35.8 °F | 49.1 °F | 4.37 in. |
| May | 44.6 °F | 58.7 °F | 3.66 in. |
| June | 52.5 °F | 67.2 °F | 4.3 in. |
| July | 58.5 °F | 73.3 °F | 3.48 in. |
| August | 59.0 °F | 73.0 °F | 3.14 in. |
| September | 53.9 °F | 66.7 °F | 4.05 in. |
| October | 45.2 °F | 56.4 °F | 5.14 in. |
| November | 36.4 °F | 47.3 °F | 4.41 in. |
| December | 26.5 °F | 38.5 °F | 4.8 in. |
| Annual | 40 °F | 53 °F | 49.48 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |