North Berwick, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.9 °F (low) to 57.4 °F (high). Annual precipitation averages 48.5 Inches. North Berwick is located in USDA Plant Hardiness Zone 5b. 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 | 14.0 °F | 32.8 °F | 3.5 in. |
| February | 15.5 °F | 35.4 °F | 3.44 in. |
| March | 24.0 °F | 43.0 °F | 4.38 in. |
| April | 34.1 °F | 55.4 °F | 4.4 in. |
| May | 44.2 °F | 66.2 °F | 3.73 in. |
| June | 53.7 °F | 75.3 °F | 4.31 in. |
| July | 59.5 °F | 80.9 °F | 3.73 in. |
| August | 58.0 °F | 79.9 °F | 3.55 in. |
| September | 50.3 °F | 72.6 °F | 3.88 in. |
| October | 39.0 °F | 60.3 °F | 4.99 in. |
| November | 29.9 °F | 49.0 °F | 4.05 in. |
| December | 21.0 °F | 38.2 °F | 4.5 in. |
| Annual | 36.9 °F | 57.4 °F | 48.46 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°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 |