Concord, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39 °F (low) to 60 °F (high). Annual precipitation averages 48 Inches. Concord is located in USDA Plant Hardiness Zone 6b. 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 | 16.6 °F | 35.3 °F | 3.69 in. |
| February | 18.3 °F | 38.2 °F | 3.33 in. |
| March | 25.9 °F | 45.7 °F | 4.44 in. |
| April | 36.2 °F | 58.4 °F | 4.14 in. |
| May | 46.4 °F | 68.8 °F | 3.66 in. |
| June | 55.8 °F | 77.5 °F | 4.22 in. |
| July | 61.5 °F | 83.4 °F | 3.64 in. |
| August | 60.2 °F | 82.0 °F | 3.8 in. |
| September | 52.1 °F | 75.0 °F | 3.71 in. |
| October | 40.8 °F | 62.7 °F | 4.83 in. |
| November | 31.3 °F | 51.6 °F | 3.89 in. |
| December | 23.1 °F | 41.1 °F | 4.67 in. |
| Annual | 39 °F | 60 °F | 48.02 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |