Bar Harbor, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.8 °F (low) to 53.7 °F (high). Annual precipitation averages 53.7 Inches. Bar Harbor 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.1 °F | 31.2 °F | 4.67 in. |
| February | 17.0 °F | 32.8 °F | 3.9 in. |
| March | 24.5 °F | 39.3 °F | 4.81 in. |
| April | 34.6 °F | 50.2 °F | 4.49 in. |
| May | 43.5 °F | 60.9 °F | 4.45 in. |
| June | 51.9 °F | 69.9 °F | 4.15 in. |
| July | 57.6 °F | 75.6 °F | 3.21 in. |
| August | 57.9 °F | 75.2 °F | 2.92 in. |
| September | 52.0 °F | 68.0 °F | 4.12 in. |
| October | 42.7 °F | 57.0 °F | 5.73 in. |
| November | 33.2 °F | 46.8 °F | 5.61 in. |
| December | 22.8 °F | 37.7 °F | 5.67 in. |
| Annual | 37.8 °F | 53.7 °F | 53.73 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |