Freeport, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.1 °F (low) to 55.4 °F (high). Annual precipitation averages 50.4 Inches. 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 | 12.4 °F | 30.5 °F | 3.61 in. |
| February | 14.4 °F | 33.4 °F | 3.57 in. |
| March | 23.6 °F | 41.0 °F | 4.08 in. |
| April | 34.1 °F | 53.1 °F | 4.62 in. |
| May | 44.4 °F | 64.0 °F | 3.64 in. |
| June | 54.1 °F | 72.8 °F | 4.71 in. |
| July | 60.1 °F | 78.8 °F | 3.7 in. |
| August | 58.9 °F | 78.2 °F | 3.52 in. |
| September | 51.5 °F | 70.9 °F | 4.06 in. |
| October | 40.5 °F | 58.6 °F | 5.65 in. |
| November | 30.6 °F | 47.1 °F | 4.5 in. |
| December | 20.3 °F | 36.7 °F | 4.72 in. |
| Annual | 37.1 °F | 55.4 °F | 50.38 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |