Berlin, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.7 °F (low) to 59.4 °F (high). Annual precipitation averages 49.6 Inches. Berlin 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 | 15.8 °F | 34.6 °F | 3.78 in. |
| February | 17.3 °F | 37.3 °F | 3.34 in. |
| March | 25.3 °F | 45.0 °F | 4.48 in. |
| April | 35.8 °F | 57.9 °F | 4.27 in. |
| May | 46.5 °F | 68.6 °F | 3.65 in. |
| June | 56.0 °F | 77.1 °F | 4.33 in. |
| July | 61.7 °F | 82.9 °F | 3.89 in. |
| August | 60.2 °F | 81.4 °F | 4.36 in. |
| September | 51.8 °F | 74.5 °F | 4.08 in. |
| October | 40.4 °F | 62.3 °F | 4.94 in. |
| November | 30.8 °F | 51.0 °F | 3.88 in. |
| December | 22.4 °F | 40.5 °F | 4.61 in. |
| Annual | 38.7 °F | 59.4 °F | 49.61 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 |