Atkinson, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.5 °F (low) to 58.8 °F (high). Annual precipitation averages 47.3 Inches. Atkinson is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.7 °F | 33.8 °F | 3.34 in. |
| February | 16.4 °F | 36.7 °F | 3.33 in. |
| March | 24.1 °F | 44.5 °F | 4.33 in. |
| April | 34.6 °F | 57.7 °F | 4.09 in. |
| May | 45.1 °F | 68.4 °F | 3.9 in. |
| June | 54.6 °F | 77.1 °F | 4.18 in. |
| July | 60.3 °F | 82.6 °F | 3.58 in. |
| August | 58.5 °F | 81.1 °F | 3.63 in. |
| September | 50.8 °F | 73.8 °F | 3.85 in. |
| October | 39.2 °F | 61.1 °F | 4.88 in. |
| November | 30.0 °F | 49.9 °F | 3.83 in. |
| December | 21.3 °F | 39.2 °F | 4.4 in. |
| Annual | 37.5 °F | 58.8 °F | 47.34 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |