York Harbor, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.8 °F (low) to 56.9 °F (high). Annual precipitation averages 48.6 Inches. York Harbor is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.7 °F | 33.5 °F | 3.7 in. |
| February | 19.6 °F | 35.8 °F | 3.54 in. |
| March | 26.6 °F | 42.9 °F | 4.39 in. |
| April | 36.0 °F | 54.6 °F | 4.49 in. |
| May | 45.4 °F | 64.8 °F | 3.79 in. |
| June | 54.2 °F | 73.8 °F | 4.26 in. |
| July | 60.2 °F | 79.5 °F | 3.57 in. |
| August | 60.0 °F | 78.6 °F | 3.4 in. |
| September | 53.7 °F | 71.3 °F | 3.94 in. |
| October | 43.5 °F | 59.4 °F | 5.05 in. |
| November | 34.1 °F | 49.0 °F | 3.97 in. |
| December | 25.0 °F | 39.1 °F | 4.5 in. |
| Annual | 39.8 °F | 56.9 °F | 48.6 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |