Mechanic Falls, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.7 °F (low) to 55.4 °F (high). Annual precipitation averages 49.2 Inches. Mechanic Falls 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 | 10.3 °F | 29.5 °F | 3.33 in. |
| February | 11.6 °F | 32.3 °F | 3.28 in. |
| March | 21.6 °F | 41.0 °F | 3.74 in. |
| April | 33.0 °F | 53.2 °F | 4.37 in. |
| May | 43.9 °F | 65.3 °F | 3.76 in. |
| June | 53.9 °F | 73.9 °F | 4.94 in. |
| July | 59.5 °F | 79.8 °F | 3.95 in. |
| August | 58.1 °F | 78.8 °F | 3.71 in. |
| September | 50.3 °F | 71.3 °F | 3.89 in. |
| October | 38.8 °F | 58.1 °F | 5.52 in. |
| November | 28.9 °F | 46.1 °F | 4.31 in. |
| December | 18.3 °F | 35.4 °F | 4.37 in. |
| Annual | 35.7 °F | 55.4 °F | 49.17 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |