Devens, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 59.4 °F (high). Annual precipitation averages 48.6 Inches. Devens 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 | 15.1 °F | 34.2 °F | 3.62 in. |
| February | 16.9 °F | 36.9 °F | 3.38 in. |
| March | 24.9 °F | 44.7 °F | 4.33 in. |
| April | 35.7 °F | 58.0 °F | 4.05 in. |
| May | 46.4 °F | 69.0 °F | 3.74 in. |
| June | 56.0 °F | 77.8 °F | 4.47 in. |
| July | 61.6 °F | 83.4 °F | 3.74 in. |
| August | 59.9 °F | 81.9 °F | 3.95 in. |
| September | 51.8 °F | 74.7 °F | 4.03 in. |
| October | 40.0 °F | 62.1 °F | 4.87 in. |
| November | 30.4 °F | 50.6 °F | 3.89 in. |
| December | 21.8 °F | 40.0 °F | 4.5 in. |
| Annual | 38.4 °F | 59.4 °F | 48.57 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 |