Concord, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.6 °F (low) to 57.8 °F (high). Annual precipitation averages 45.1 Inches. Concord 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 | 31.7 °F | 3.04 in. |
| February | 14.1 °F | 34.8 °F | 3.05 in. |
| March | 23.0 °F | 42.9 °F | 3.46 in. |
| April | 34.0 °F | 56.3 °F | 3.75 in. |
| May | 45.0 °F | 68.1 °F | 3.51 in. |
| June | 54.6 °F | 77.1 °F | 4.25 in. |
| July | 60.1 °F | 82.3 °F | 4.01 in. |
| August | 58.1 °F | 81.0 °F | 3.63 in. |
| September | 50.4 °F | 73.4 °F | 3.82 in. |
| October | 38.8 °F | 60.3 °F | 4.87 in. |
| November | 29.2 °F | 48.4 °F | 3.55 in. |
| December | 19.7 °F | 37.4 °F | 4.14 in. |
| Annual | 36.6 °F | 57.8 °F | 45.08 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |