Newington, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.1 °F (low) to 57.9 °F (high). Annual precipitation averages 47.8 Inches. Newington 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.8 °F | 33.6 °F | 3.46 in. |
| February | 17.2 °F | 36.2 °F | 3.44 in. |
| March | 25.0 °F | 43.5 °F | 4.34 in. |
| April | 35.0 °F | 56.0 °F | 4.47 in. |
| May | 45.1 °F | 66.3 °F | 3.86 in. |
| June | 54.8 °F | 75.7 °F | 4.14 in. |
| July | 60.4 °F | 81.5 °F | 3.68 in. |
| August | 59.0 °F | 80.4 °F | 3.22 in. |
| September | 51.5 °F | 73.0 °F | 3.95 in. |
| October | 40.3 °F | 60.7 °F | 4.85 in. |
| November | 31.1 °F | 49.5 °F | 3.97 in. |
| December | 22.3 °F | 38.9 °F | 4.45 in. |
| Annual | 38.1 °F | 57.9 °F | 47.83 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |