Falmouth, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.2 °C (low) to 13.2 °C (high). Annual precipitation averages 1227.3 Millimeters. Falmouth is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.9 °C | 0 °C | 89.41 mm |
| February | -7.8 °C | 1.4 °C | 89.41 mm |
| March | -3.2 °C | 5.3 °C | 102.62 mm |
| April | 2.5 °C | 11.5 °C | 112.78 mm |
| May | 8 °C | 17.3 °C | 91.95 mm |
| June | 13.3 °C | 22.7 °C | 109.98 mm |
| July | 16.6 °C | 25.8 °C | 88.14 mm |
| August | 16.3 °C | 25.6 °C | 85.34 mm |
| September | 12.1 °C | 21.6 °C | 101.09 mm |
| October | 6 °C | 15 °C | 130.05 mm |
| November | 0.6 °C | 8.9 °C | 108.2 mm |
| December | -4.8 °C | 3.3 °C | 118.36 mm |
| Annual | 4.2 °C | 13.2 °C | 1227.33 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |