Blue Hill, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 12.4 °C (high). Annual precipitation averages 1243.8 Millimeters. Blue Hill is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.3 °C | -1.4 °C | 100.58 mm |
| February | -10.3 °C | 0 °C | 86.61 mm |
| March | -5.7 °C | 4.2 °C | 104.39 mm |
| April | 0.2 °C | 10.7 °C | 111.51 mm |
| May | 5.8 °C | 17.2 °C | 97.54 mm |
| June | 11 °C | 22.3 °C | 104.39 mm |
| July | 14.4 °C | 25.5 °C | 80.26 mm |
| August | 13.8 °C | 25.1 °C | 81.03 mm |
| September | 9.8 °C | 20.9 °C | 99.82 mm |
| October | 4.1 °C | 14.1 °C | 132.08 mm |
| November | -1.2 °C | 7.8 °C | 123.19 mm |
| December | -7.2 °C | 1.9 °C | 122.43 mm |
| Annual | 2 °C | 12.4 °C | 1243.83 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |