Hebron, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.8 °C (low) to 12.5 °C (high). Annual precipitation averages 1273.5 Millimeters. Hebron 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 | -12.2 °C | -2.2 °C | 88.14 mm |
| February | -11.3 °C | -0.6 °C | 84.07 mm |
| March | -6.1 °C | 4.3 °C | 96.77 mm |
| April | 0.3 °C | 11.5 °C | 111.76 mm |
| May | 6.3 °C | 18.4 °C | 98.81 mm |
| June | 11.8 °C | 23.1 °C | 129.29 mm |
| July | 14.9 °C | 26.2 °C | 103.63 mm |
| August | 14.1 °C | 25.7 °C | 98.04 mm |
| September | 9.7 °C | 21.4 °C | 96.77 mm |
| October | 3.4 °C | 14.2 °C | 142.49 mm |
| November | -2 °C | 7.3 °C | 110.74 mm |
| December | -7.7 °C | 1.2 °C | 113.03 mm |
| Annual | 1.8 °C | 12.5 °C | 1273.54 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |