Ashfield, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.7 °F (low) to 54.1 °F (high). Annual precipitation averages 54.8 Inches. Ashfield is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.0 °F | 29.4 °F | 3.82 in. |
| February | 13.4 °F | 32.4 °F | 3.46 in. |
| March | 20.6 °F | 39.8 °F | 4.79 in. |
| April | 31.6 °F | 52.4 °F | 4.67 in. |
| May | 42.4 °F | 64.0 °F | 4.19 in. |
| June | 51.7 °F | 72.5 °F | 4.91 in. |
| July | 57.4 °F | 77.8 °F | 4.53 in. |
| August | 55.8 °F | 76.0 °F | 4.67 in. |
| September | 48.0 °F | 69.2 °F | 5.16 in. |
| October | 37.2 °F | 56.5 °F | 5.48 in. |
| November | 27.6 °F | 44.9 °F | 4.29 in. |
| December | 18.4 °F | 34.5 °F | 4.79 in. |
| Annual | 34.7 °F | 54.1 °F | 54.76 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |