Machias, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.9 °F (low) to 53.8 °F (high). Annual precipitation averages 52.9 Inches. Machias 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 | 8.6 °F | 29.8 °F | 4.71 in. |
| February | 11.2 °F | 31.9 °F | 3.8 in. |
| March | 19.6 °F | 39.3 °F | 4.72 in. |
| April | 30.5 °F | 50.3 °F | 4.28 in. |
| May | 40.3 °F | 61.0 °F | 4.1 in. |
| June | 48.8 °F | 70.2 °F | 3.85 in. |
| July | 54.0 °F | 75.8 °F | 3.5 in. |
| August | 53.5 °F | 76.6 °F | 3.25 in. |
| September | 46.2 °F | 69.5 °F | 4.12 in. |
| October | 36.0 °F | 58.2 °F | 5.69 in. |
| November | 28.4 °F | 46.5 °F | 5.38 in. |
| December | 18.2 °F | 36.2 °F | 5.53 in. |
| Annual | 32.9 °F | 53.8 °F | 52.93 in. |
| 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 : -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 |