Ashland, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 15.6 °C (high). Annual precipitation averages 1237.5 Millimeters. Ashland is located in USDA Plant Hardiness Zone 6b. 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 | -8.3 °C | 2.1 °C | 98.3 mm |
| February | -7.6 °C | 3.6 °C | 85.85 mm |
| March | -3.2 °C | 7.7 °C | 116.84 mm |
| April | 2.4 °C | 14.7 °C | 109.73 mm |
| May | 8.2 °C | 20.4 °C | 88.39 mm |
| June | 13.4 °C | 25.2 °C | 107.44 mm |
| July | 16.7 °C | 28.4 °C | 92.46 mm |
| August | 15.8 °C | 27.6 °C | 98.55 mm |
| September | 11.3 °C | 23.9 °C | 95.76 mm |
| October | 4.9 °C | 17.2 °C | 120.14 mm |
| November | -0.2 °C | 11 °C | 99.82 mm |
| December | -4.8 °C | 5.2 °C | 124.21 mm |
| Annual | 4.1 °C | 15.6 °C | 1237.49 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |