Newport, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.1 °F (low) to 55.9 °F (high). Annual precipitation averages 42.4 Inches. Newport is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.5 °F | 29.2 °F | 2.77 in. |
| February | 9.7 °F | 32.5 °F | 2.4 in. |
| March | 18.7 °F | 40.6 °F | 2.95 in. |
| April | 30.6 °F | 54.5 °F | 3.31 in. |
| May | 41.8 °F | 67.2 °F | 3.39 in. |
| June | 51.3 °F | 75.8 °F | 4.27 in. |
| July | 56.3 °F | 80.7 °F | 4.24 in. |
| August | 54.3 °F | 79.1 °F | 3.8 in. |
| September | 46.5 °F | 71.8 °F | 3.6 in. |
| October | 35.8 °F | 58.4 °F | 4.94 in. |
| November | 26.6 °F | 45.8 °F | 3.25 in. |
| December | 17.0 °F | 34.9 °F | 3.47 in. |
| Annual | 33.1 °F | 55.9 °F | 42.39 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |