Devens, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.5 °C (low) to 15.2 °C (high). Annual precipitation averages 1233.7 Millimeters. 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 | -9.4 °C | 1.2 °C | 91.95 mm |
| February | -8.4 °C | 2.7 °C | 85.85 mm |
| March | -3.9 °C | 7.1 °C | 109.98 mm |
| April | 2.1 °C | 14.4 °C | 102.87 mm |
| May | 8 °C | 20.6 °C | 95 mm |
| June | 13.3 °C | 25.4 °C | 113.54 mm |
| July | 16.4 °C | 28.6 °C | 95 mm |
| August | 15.5 °C | 27.7 °C | 100.33 mm |
| September | 11 °C | 23.7 °C | 102.36 mm |
| October | 4.4 °C | 16.7 °C | 123.7 mm |
| November | -0.9 °C | 10.3 °C | 98.81 mm |
| December | -5.7 °C | 4.4 °C | 114.3 mm |
| Annual | 3.5 °C | 15.2 °C | 1233.69 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |