Townsend, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.6 °F (low) to 59.2 °F (high). Annual precipitation averages 48.8 Inches. Townsend 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 | 14.4 °F | 33.8 °F | 3.66 in. |
| February | 16.1 °F | 36.7 °F | 3.36 in. |
| March | 24.2 °F | 44.6 °F | 4.32 in. |
| April | 34.9 °F | 57.9 °F | 4.07 in. |
| May | 45.8 °F | 69.0 °F | 3.79 in. |
| June | 55.3 °F | 77.9 °F | 4.4 in. |
| July | 60.8 °F | 83.4 °F | 3.82 in. |
| August | 58.9 °F | 81.7 °F | 3.85 in. |
| September | 51.1 °F | 74.4 °F | 4.14 in. |
| October | 39.1 °F | 61.7 °F | 4.97 in. |
| November | 29.8 °F | 49.9 °F | 3.94 in. |
| December | 21.0 °F | 39.2 °F | 4.48 in. |
| Annual | 37.6 °F | 59.2 °F | 48.8 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |