Bernardston, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.2 °F (low) to 56.7 °F (high). Annual precipitation averages 51.2 Inches. Bernardston 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 | 12.0 °F | 31.2 °F | 3.71 in. |
| February | 12.7 °F | 34.1 °F | 3.34 in. |
| March | 21.5 °F | 42.2 °F | 4.0 in. |
| April | 32.7 °F | 55.1 °F | 4.17 in. |
| May | 43.6 °F | 67.0 °F | 4.01 in. |
| June | 52.9 °F | 76.0 °F | 4.74 in. |
| July | 58.2 °F | 81.0 °F | 4.38 in. |
| August | 56.2 °F | 79.4 °F | 4.35 in. |
| September | 48.3 °F | 72.1 °F | 4.75 in. |
| October | 37.5 °F | 59.1 °F | 5.42 in. |
| November | 28.1 °F | 46.9 °F | 4.0 in. |
| December | 19.0 °F | 36.0 °F | 4.31 in. |
| Annual | 35.2 °F | 56.7 °F | 51.18 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |