Lincoln, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.6 °F (low) to 53.6 °F (high). Annual precipitation averages 45.8 Inches. Lincoln is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.6 °F | 26.2 °F | 3.63 in. |
| February | 5.5 °F | 29.3 °F | 2.87 in. |
| March | 17.1 °F | 38.4 °F | 3.42 in. |
| April | 29.6 °F | 50.9 °F | 3.67 in. |
| May | 40.5 °F | 64.3 °F | 3.61 in. |
| June | 49.9 °F | 73.2 °F | 4.44 in. |
| July | 56.0 °F | 78.8 °F | 3.56 in. |
| August | 53.9 °F | 78.2 °F | 3.5 in. |
| September | 46.0 °F | 70.3 °F | 3.74 in. |
| October | 35.2 °F | 56.9 °F | 4.82 in. |
| November | 26.2 °F | 44.0 °F | 4.21 in. |
| December | 14.1 °F | 32.6 °F | 4.34 in. |
| Annual | 31.6 °F | 53.6 °F | 45.81 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |