Douglas, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.5 °F (low) to 58.6 °F (high). Annual precipitation averages 50.4 Inches. Douglas 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 | 17.6 °F | 34.8 °F | 3.92 in. |
| February | 18.7 °F | 37.3 °F | 3.47 in. |
| March | 26.1 °F | 44.8 °F | 4.72 in. |
| April | 36.3 °F | 57.2 °F | 4.53 in. |
| May | 46.7 °F | 67.9 °F | 3.6 in. |
| June | 55.8 °F | 75.9 °F | 4.24 in. |
| July | 61.7 °F | 81.3 °F | 3.9 in. |
| August | 60.1 °F | 79.6 °F | 4.17 in. |
| September | 53.0 °F | 72.7 °F | 4.09 in. |
| October | 41.8 °F | 61.0 °F | 4.99 in. |
| November | 32.1 °F | 50.2 °F | 3.95 in. |
| December | 23.7 °F | 40.0 °F | 4.84 in. |
| Annual | 39.5 °F | 58.6 °F | 50.42 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°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 |