Kennebunkport, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.2 °F (low) to 55.6 °F (high). Annual precipitation averages 51 Inches. Kennebunkport is located in USDA Plant Hardiness Zone 6a. 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 | 17.4 °F | 33.0 °F | 3.66 in. |
| February | 18.4 °F | 35.2 °F | 3.68 in. |
| March | 26.1 °F | 41.8 °F | 4.61 in. |
| April | 35.5 °F | 52.4 °F | 4.68 in. |
| May | 45.0 °F | 62.3 °F | 3.95 in. |
| June | 54.4 °F | 71.7 °F | 4.43 in. |
| July | 60.2 °F | 77.3 °F | 3.78 in. |
| August | 59.5 °F | 76.7 °F | 3.81 in. |
| September | 53.2 °F | 70.0 °F | 3.93 in. |
| October | 42.8 °F | 58.8 °F | 5.54 in. |
| November | 33.5 °F | 48.5 °F | 4.17 in. |
| December | 24.2 °F | 38.9 °F | 4.72 in. |
| Annual | 39.2 °F | 55.6 °F | 50.96 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 6a : -10°F to -5°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 |