Hatfield, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 59.8 °F (high). Annual precipitation averages 47 Inches. Hatfield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 34.2 °F | 3.25 in. |
| February | 16.5 °F | 37.1 °F | 2.96 in. |
| March | 25.3 °F | 45.5 °F | 3.55 in. |
| April | 35.9 °F | 59.0 °F | 3.83 in. |
| May | 46.6 °F | 70.3 °F | 3.66 in. |
| June | 55.9 °F | 78.7 °F | 4.5 in. |
| July | 61.3 °F | 83.8 °F | 4.11 in. |
| August | 59.5 °F | 82.2 °F | 4.18 in. |
| September | 51.7 °F | 75.0 °F | 4.59 in. |
| October | 40.1 °F | 62.0 °F | 4.88 in. |
| November | 30.2 °F | 50.1 °F | 3.42 in. |
| December | 22.0 °F | 39.4 °F | 4.08 in. |
| Annual | 38.4 °F | 59.8 °F | 47.01 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |