Townsend, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.1 °C (low) to 15.1 °C (high). Annual precipitation averages 1239.5 Millimeters. 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 | -9.8 °C | 1 °C | 92.96 mm |
| February | -8.8 °C | 2.6 °C | 85.34 mm |
| March | -4.3 °C | 7 °C | 109.73 mm |
| April | 1.6 °C | 14.4 °C | 103.38 mm |
| May | 7.7 °C | 20.6 °C | 96.27 mm |
| June | 12.9 °C | 25.5 °C | 111.76 mm |
| July | 16 °C | 28.6 °C | 97.03 mm |
| August | 14.9 °C | 27.6 °C | 97.79 mm |
| September | 10.6 °C | 23.6 °C | 105.16 mm |
| October | 3.9 °C | 16.5 °C | 126.24 mm |
| November | -1.2 °C | 9.9 °C | 100.08 mm |
| December | -6.1 °C | 4 °C | 113.79 mm |
| Annual | 3.1 °C | 15.1 °C | 1239.53 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |