Ashland, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.4 °C (low) to 10.2 °C (high). Annual precipitation averages 1036.1 Millimeters. Ashland is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.7 °C | -6.1 °C | 78.23 mm |
| February | -16.7 °C | -4.4 °C | 62.74 mm |
| March | -10.4 °C | 1.1 °C | 68.58 mm |
| April | -2.4 °C | 8.6 °C | 75.69 mm |
| May | 4.2 °C | 17.1 °C | 87.12 mm |
| June | 9.6 °C | 22.4 °C | 103.89 mm |
| July | 12.6 °C | 25.2 °C | 101.35 mm |
| August | 11.4 °C | 24.6 °C | 94.49 mm |
| September | 7 °C | 19.9 °C | 87.63 mm |
| October | 1.4 °C | 12 °C | 101.85 mm |
| November | -4.2 °C | 4.3 °C | 84.07 mm |
| December | -11.8 °C | -2.4 °C | 90.42 mm |
| Annual | -1.4 °C | 10.2 °C | 1036.06 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |