Housatonic, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 14.6 °C (high). Annual precipitation averages 1161 Millimeters. Housatonic is located in USDA Plant Hardiness Zone 5b. 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 | -10.2 °C | 0.3 °C | 80.77 mm |
| February | -9.4 °C | 2.1 °C | 59.94 mm |
| March | -4.8 °C | 6.7 °C | 82.8 mm |
| April | 1 °C | 14.4 °C | 95.25 mm |
| May | 7.1 °C | 20.9 °C | 94.23 mm |
| June | 12.1 °C | 25.1 °C | 115.57 mm |
| July | 14.8 °C | 27.8 °C | 117.6 mm |
| August | 14.1 °C | 26.7 °C | 116.59 mm |
| September | 9.6 °C | 22.7 °C | 105.66 mm |
| October | 3.5 °C | 15.9 °C | 111.76 mm |
| November | -1.4 °C | 9.3 °C | 84.84 mm |
| December | -6.1 °C | 3.1 °C | 96.01 mm |
| Annual | 2.5 °C | 14.6 °C | 1161.02 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |