New Gloucester, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 54.9 °F (high). Annual precipitation averages 50.1 Inches. New Gloucester 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 | 11.1 °F | 29.0 °F | 3.36 in. |
| February | 12.6 °F | 31.9 °F | 3.62 in. |
| March | 21.8 °F | 40.4 °F | 3.81 in. |
| April | 33.2 °F | 53.1 °F | 4.41 in. |
| May | 43.9 °F | 64.8 °F | 3.67 in. |
| June | 54.0 °F | 73.6 °F | 4.9 in. |
| July | 59.9 °F | 79.3 °F | 3.82 in. |
| August | 58.3 °F | 78.2 °F | 3.68 in. |
| September | 50.6 °F | 70.5 °F | 3.9 in. |
| October | 38.9 °F | 57.7 °F | 5.73 in. |
| November | 29.1 °F | 45.6 °F | 4.47 in. |
| December | 18.8 °F | 35.0 °F | 4.68 in. |
| Annual | 36 °F | 54.9 °F | 50.05 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 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 |