Attleboro, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41 °F (low) to 60.4 °F (high). Annual precipitation averages 51 Inches. Attleboro 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 | 19.6 °F | 37.4 °F | 4.25 in. |
| February | 20.9 °F | 39.6 °F | 3.63 in. |
| March | 28.0 °F | 46.6 °F | 5.09 in. |
| April | 37.7 °F | 58.2 °F | 4.62 in. |
| May | 47.6 °F | 68.6 °F | 3.61 in. |
| June | 57.0 °F | 77.2 °F | 4.16 in. |
| July | 63.2 °F | 83.0 °F | 3.52 in. |
| August | 61.7 °F | 81.6 °F | 3.87 in. |
| September | 54.4 °F | 74.5 °F | 4.08 in. |
| October | 42.9 °F | 62.9 °F | 4.97 in. |
| November | 33.7 °F | 52.5 °F | 4.34 in. |
| December | 25.5 °F | 42.6 °F | 4.89 in. |
| Annual | 41 °F | 60.4 °F | 51.03 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |