Forestdale, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 42.9 °F (low) to 58.4 °F (high). Annual precipitation averages 51.1 Inches. Forestdale is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.2 °F | 38.5 °F | 4.21 in. |
| February | 23.1 °F | 39.2 °F | 3.75 in. |
| March | 29.3 °F | 44.9 °F | 5.21 in. |
| April | 38.5 °F | 54.7 °F | 4.66 in. |
| May | 48.0 °F | 64.3 °F | 3.63 in. |
| June | 57.6 °F | 72.9 °F | 3.88 in. |
| July | 64.4 °F | 78.9 °F | 3.07 in. |
| August | 63.3 °F | 77.7 °F | 3.61 in. |
| September | 56.9 °F | 71.6 °F | 4.26 in. |
| October | 46.1 °F | 61.4 °F | 4.95 in. |
| November | 36.6 °F | 52.6 °F | 4.37 in. |
| December | 28.3 °F | 43.8 °F | 5.46 in. |
| Annual | 42.9 °F | 58.4 °F | 51.06 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°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 |