Freeport, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 13 °C (high). Annual precipitation averages 1279.7 Millimeters. Freeport 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 | -10.9 °C | -0.8 °C | 91.69 mm |
| February | -9.8 °C | 0.8 °C | 90.68 mm |
| March | -4.7 °C | 5 °C | 103.63 mm |
| April | 1.2 °C | 11.7 °C | 117.35 mm |
| May | 6.9 °C | 17.8 °C | 92.46 mm |
| June | 12.3 °C | 22.7 °C | 119.63 mm |
| July | 15.6 °C | 26 °C | 93.98 mm |
| August | 14.9 °C | 25.7 °C | 89.41 mm |
| September | 10.8 °C | 21.6 °C | 103.12 mm |
| October | 4.7 °C | 14.8 °C | 143.51 mm |
| November | -0.8 °C | 8.4 °C | 114.3 mm |
| December | -6.5 °C | 2.6 °C | 119.89 mm |
| Annual | 2.8 °C | 13 °C | 1279.65 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 |