Milbridge, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.1 °C (high). Annual precipitation averages 1313.4 Millimeters. Milbridge is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.1 °C | -1 °C | 115.57 mm |
| February | -9.9 °C | 0.3 °C | 95 mm |
| March | -5.3 °C | 4.1 °C | 115.82 mm |
| April | 0.4 °C | 10.2 °C | 109.73 mm |
| May | 5.9 °C | 16.2 °C | 103.63 mm |
| June | 10.6 °C | 21.2 °C | 102.36 mm |
| July | 13.7 °C | 24.4 °C | 85.34 mm |
| August | 13.7 °C | 24.4 °C | 79.25 mm |
| September | 9.7 °C | 20.4 °C | 99.31 mm |
| October | 4.4 °C | 14.1 °C | 138.43 mm |
| November | -0.8 °C | 8.1 °C | 133.35 mm |
| December | -6.8 °C | 2.4 °C | 135.64 mm |
| Annual | 2 °C | 12.1 °C | 1313.43 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |