Machias, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.5 °F (low) to 55 °F (high). Annual precipitation averages 45.9 Inches. Machias is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.8 °F | 29.6 °F | 3.49 in. |
| February | 13.3 °F | 32.1 °F | 2.6 in. |
| March | 19.9 °F | 40.2 °F | 3.09 in. |
| April | 31.3 °F | 53.8 °F | 3.62 in. |
| May | 42.6 °F | 66.3 °F | 3.85 in. |
| June | 51.4 °F | 74.2 °F | 4.45 in. |
| July | 55.6 °F | 78.1 °F | 4.54 in. |
| August | 53.8 °F | 76.8 °F | 4.19 in. |
| September | 47.4 °F | 70.3 °F | 4.25 in. |
| October | 37.2 °F | 58.1 °F | 4.25 in. |
| November | 28.2 °F | 45.4 °F | 3.81 in. |
| December | 20.1 °F | 34.8 °F | 3.79 in. |
| Annual | 34.5 °F | 55 °F | 45.93 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |