Millinocket, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.6 °F (low) to 52.8 °F (high). Annual precipitation averages 45.1 Inches. Millinocket is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.0 °F | 24.6 °F | 3.31 in. |
| February | 5.1 °F | 28.1 °F | 2.67 in. |
| March | 16.4 °F | 37.5 °F | 3.43 in. |
| April | 29.3 °F | 50.2 °F | 3.71 in. |
| May | 40.7 °F | 64.1 °F | 3.67 in. |
| June | 50.6 °F | 73.0 °F | 4.17 in. |
| July | 56.8 °F | 78.7 °F | 3.69 in. |
| August | 54.3 °F | 77.5 °F | 3.73 in. |
| September | 46.6 °F | 69.9 °F | 3.5 in. |
| October | 35.6 °F | 55.7 °F | 4.97 in. |
| November | 26.1 °F | 42.9 °F | 4.1 in. |
| December | 13.8 °F | 31.2 °F | 4.19 in. |
| Annual | 31.6 °F | 52.8 °F | 45.14 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |