Chesterfield, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.9 °F (low) to 55.5 °F (high). Annual precipitation averages 52.1 Inches. Chesterfield is located in USDA Plant Hardiness Zone 6a. 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 | 12.3 °F | 30.4 °F | 3.63 in. |
| February | 13.3 °F | 33.1 °F | 3.42 in. |
| March | 21.0 °F | 41.1 °F | 4.13 in. |
| April | 31.9 °F | 54.3 °F | 4.12 in. |
| May | 43.0 °F | 65.8 °F | 4.18 in. |
| June | 52.1 °F | 74.1 °F | 5.02 in. |
| July | 57.7 °F | 79.3 °F | 4.49 in. |
| August | 55.9 °F | 77.5 °F | 4.33 in. |
| September | 48.3 °F | 70.5 °F | 5.13 in. |
| October | 37.6 °F | 58.2 °F | 5.22 in. |
| November | 27.6 °F | 46.1 °F | 3.97 in. |
| December | 18.6 °F | 35.4 °F | 4.48 in. |
| Annual | 34.9 °F | 55.5 °F | 52.12 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 6a : -10°F to -5°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 |