Berwick, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.3 °F (low) to 57.5 °F (high). Annual precipitation averages 46.4 Inches. Berwick 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 | 14.4 °F | 32.6 °F | 3.32 in. |
| February | 16.0 °F | 35.3 °F | 3.27 in. |
| March | 24.3 °F | 42.9 °F | 4.15 in. |
| April | 34.5 °F | 55.6 °F | 4.27 in. |
| May | 44.6 °F | 66.4 °F | 3.59 in. |
| June | 54.1 °F | 75.7 °F | 4.07 in. |
| July | 59.8 °F | 81.3 °F | 3.66 in. |
| August | 58.2 °F | 80.3 °F | 3.45 in. |
| September | 50.5 °F | 72.9 °F | 3.56 in. |
| October | 39.4 °F | 60.4 °F | 4.79 in. |
| November | 30.3 °F | 48.8 °F | 3.87 in. |
| December | 21.3 °F | 37.9 °F | 4.38 in. |
| Annual | 37.3 °F | 57.5 °F | 46.38 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 |