Woolwich, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.2 °F (low) to 55.1 °F (high). Annual precipitation averages 49.9 Inches. Woolwich 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.5 °F | 30.5 °F | 3.91 in. |
| February | 13.5 °F | 33.5 °F | 3.68 in. |
| March | 23.0 °F | 41.0 °F | 4.44 in. |
| April | 33.2 °F | 52.5 °F | 4.42 in. |
| May | 43.6 °F | 63.5 °F | 3.63 in. |
| June | 52.9 °F | 72.2 °F | 4.56 in. |
| July | 59.0 °F | 78.3 °F | 3.5 in. |
| August | 57.7 °F | 77.6 °F | 3.12 in. |
| September | 50.5 °F | 70.3 °F | 3.94 in. |
| October | 39.7 °F | 58.2 °F | 5.35 in. |
| November | 30.0 °F | 47.0 °F | 4.58 in. |
| December | 19.5 °F | 36.6 °F | 4.77 in. |
| Annual | 36.2 °F | 55.1 °F | 49.9 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |