Blandford, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.2 °F (low) to 56.7 °F (high). Annual precipitation averages 54.3 Inches. Blandford is located in USDA Plant Hardiness Zone 6a. 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 | 15.3 °F | 32.4 °F | 3.83 in. |
| February | 16.4 °F | 34.8 °F | 3.57 in. |
| March | 24.3 °F | 43.4 °F | 4.25 in. |
| April | 34.5 °F | 55.5 °F | 4.34 in. |
| May | 44.9 °F | 66.8 °F | 4.38 in. |
| June | 53.9 °F | 74.9 °F | 4.92 in. |
| July | 58.7 °F | 79.8 °F | 4.67 in. |
| August | 56.9 °F | 78.1 °F | 4.9 in. |
| September | 49.9 °F | 71.1 °F | 4.87 in. |
| October | 39.8 °F | 59.1 °F | 5.49 in. |
| November | 30.1 °F | 47.3 °F | 4.22 in. |
| December | 21.7 °F | 37.7 °F | 4.89 in. |
| Annual | 37.2 °F | 56.7 °F | 54.33 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |