Unity, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.6 °F (low) to 54.9 °F (high). Annual precipitation averages 45.9 Inches. Unity is located in USDA Plant Hardiness Zone 5a. 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 | 8.4 °F | 28.2 °F | 3.38 in. |
| February | 9.8 °F | 31.5 °F | 2.92 in. |
| March | 20.3 °F | 40.1 °F | 3.75 in. |
| April | 32.2 °F | 52.9 °F | 3.98 in. |
| May | 43.1 °F | 65.2 °F | 3.56 in. |
| June | 52.8 °F | 73.9 °F | 4.12 in. |
| July | 58.5 °F | 79.4 °F | 3.32 in. |
| August | 56.9 °F | 78.5 °F | 3.53 in. |
| September | 49.1 °F | 71.1 °F | 3.77 in. |
| October | 38.2 °F | 58.1 °F | 5.06 in. |
| November | 28.4 °F | 45.5 °F | 4.26 in. |
| December | 17.1 °F | 34.3 °F | 4.26 in. |
| Annual | 34.6 °F | 54.9 °F | 45.91 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |