Phillipston, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.4 °F (low) to 55.6 °F (high). Annual precipitation averages 48.2 Inches. Phillipston is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.3 °F | 30.4 °F | 3.68 in. |
| February | 13.6 °F | 33.4 °F | 3.17 in. |
| March | 21.1 °F | 41.0 °F | 4.1 in. |
| April | 32.7 °F | 54.2 °F | 3.8 in. |
| May | 43.1 °F | 65.4 °F | 3.61 in. |
| June | 52.6 °F | 74.4 °F | 4.65 in. |
| July | 58.1 °F | 79.7 °F | 4.13 in. |
| August | 55.5 °F | 78.0 °F | 4.33 in. |
| September | 48.5 °F | 70.4 °F | 4.14 in. |
| October | 38.0 °F | 57.6 °F | 4.83 in. |
| November | 29.5 °F | 46.5 °F | 3.75 in. |
| December | 19.3 °F | 35.8 °F | 4.05 in. |
| Annual | 35.4 °F | 55.6 °F | 48.24 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°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 |