Hubbardston, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 13.7 °C (high). Annual precipitation averages 1235.5 Millimeters. Hubbardston is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.7 °C | -0.2 °C | 91.19 mm |
| February | -9.9 °C | 1.4 °C | 81.79 mm |
| March | -5.6 °C | 5.7 °C | 105.66 mm |
| April | 0.6 °C | 13 °C | 97.28 mm |
| May | 6.7 °C | 19.3 °C | 95 mm |
| June | 11.8 °C | 24.1 °C | 112.78 mm |
| July | 14.9 °C | 27.1 °C | 110.49 mm |
| August | 13.8 °C | 26.2 °C | 109.22 mm |
| September | 9.6 °C | 22 °C | 108.71 mm |
| October | 3.3 °C | 14.9 °C | 122.68 mm |
| November | -1.8 °C | 8.6 °C | 95.25 mm |
| December | -6.8 °C | 2.7 °C | 105.41 mm |
| Annual | 2.2 °C | 13.7 °C | 1235.46 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |