Barrington, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.4 °F (low) to 57.7 °F (high). Annual precipitation averages 47.3 Inches. Barrington 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 | 14.8 °F | 32.3 °F | 3.34 in. |
| February | 16.1 °F | 35.3 °F | 3.25 in. |
| March | 24.4 °F | 42.9 °F | 4.08 in. |
| April | 34.4 °F | 56.1 °F | 4.13 in. |
| May | 44.8 °F | 67.0 °F | 3.75 in. |
| June | 54.5 °F | 76.4 °F | 4.24 in. |
| July | 59.9 °F | 81.8 °F | 3.88 in. |
| August | 58.5 °F | 80.5 °F | 3.76 in. |
| September | 50.7 °F | 73.2 °F | 3.77 in. |
| October | 39.8 °F | 60.4 °F | 4.72 in. |
| November | 30.2 °F | 48.6 °F | 3.99 in. |
| December | 21.2 °F | 37.8 °F | 4.37 in. |
| Annual | 37.4 °F | 57.7 °F | 47.28 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |