Mechanic Falls, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.1 °C (low) to 13 °C (high). Annual precipitation averages 1248.9 Millimeters. 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 | -12.1 °C | -1.4 °C | 84.58 mm |
| February | -11.3 °C | 0.2 °C | 83.31 mm |
| March | -5.8 °C | 5 °C | 95 mm |
| April | 0.6 °C | 11.8 °C | 111 mm |
| May | 6.6 °C | 18.5 °C | 95.5 mm |
| June | 12.2 °C | 23.3 °C | 125.48 mm |
| July | 15.3 °C | 26.6 °C | 100.33 mm |
| August | 14.5 °C | 26 °C | 94.23 mm |
| September | 10.2 °C | 21.8 °C | 98.81 mm |
| October | 3.8 °C | 14.5 °C | 140.21 mm |
| November | -1.7 °C | 7.8 °C | 109.47 mm |
| December | -7.6 °C | 1.9 °C | 111 mm |
| Annual | 2.1 °C | 13 °C | 1248.92 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |