Bucksport, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.4 °C (low) to 12.5 °C (high). Annual precipitation averages 1217.2 Millimeters. Bucksport 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 | -12.8 °C | -1.8 °C | 97.03 mm |
| February | -11.8 °C | -0.2 °C | 81.79 mm |
| March | -6.1 °C | 4.2 °C | 103.89 mm |
| April | -0.1 °C | 11.1 °C | 108.97 mm |
| May | 5.7 °C | 17.7 °C | 95 mm |
| June | 10.8 °C | 22.7 °C | 103.38 mm |
| July | 14.3 °C | 25.9 °C | 82.8 mm |
| August | 13.3 °C | 25.4 °C | 84.07 mm |
| September | 9.2 °C | 21.3 °C | 97.03 mm |
| October | 3.3 °C | 14.3 °C | 129.54 mm |
| November | -1.7 °C | 7.7 °C | 113.79 mm |
| December | -7.9 °C | 1.6 °C | 119.89 mm |
| Annual | 1.4 °C | 12.5 °C | 1217.18 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |