Machiasport, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.1 °F (low) to 51.8 °F (high). Annual precipitation averages 51.7 Inches. Machiasport 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.0 °F | 30.9 °F | 4.59 in. |
| February | 16.2 °F | 32.0 °F | 3.72 in. |
| March | 23.2 °F | 38.5 °F | 4.56 in. |
| April | 33.2 °F | 47.8 °F | 4.21 in. |
| May | 41.4 °F | 57.3 °F | 3.99 in. |
| June | 49.0 °F | 66.2 °F | 3.91 in. |
| July | 54.3 °F | 71.4 °F | 3.42 in. |
| August | 54.8 °F | 71.6 °F | 3.21 in. |
| September | 49.8 °F | 66.3 °F | 4.01 in. |
| October | 41.1 °F | 56.2 °F | 5.51 in. |
| November | 32.2 °F | 46.1 °F | 5.17 in. |
| December | 22.7 °F | 37.3 °F | 5.37 in. |
| Annual | 36.1 °F | 51.8 °F | 51.67 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |