Newbury, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.8 °F (low) to 55.1 °F (high). Annual precipitation averages 51.1 Inches. Newbury is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.0 °F | 29.0 °F | 3.52 in. |
| February | 13.5 °F | 32.0 °F | 3.14 in. |
| March | 21.3 °F | 40.3 °F | 3.84 in. |
| April | 32.9 °F | 53.9 °F | 4.19 in. |
| May | 43.6 °F | 66.2 °F | 4.09 in. |
| June | 53.8 °F | 74.6 °F | 4.83 in. |
| July | 59.0 °F | 79.3 °F | 4.67 in. |
| August | 56.8 °F | 77.7 °F | 4.25 in. |
| September | 49.2 °F | 70.5 °F | 4.23 in. |
| October | 39.0 °F | 57.4 °F | 5.56 in. |
| November | 29.0 °F | 45.7 °F | 4.12 in. |
| December | 19.9 °F | 34.7 °F | 4.67 in. |
| Annual | 35.8 °F | 55.1 °F | 51.11 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |