Newport, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.1 °F (low) to 54.8 °F (high). Annual precipitation averages 44.6 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.3 °F | 27.2 °F | 3.38 in. |
| February | 7.7 °F | 30.7 °F | 2.82 in. |
| March | 18.8 °F | 39.7 °F | 3.48 in. |
| April | 30.9 °F | 53.1 °F | 3.76 in. |
| May | 41.9 °F | 65.9 °F | 3.54 in. |
| June | 51.6 °F | 74.5 °F | 4.13 in. |
| July | 57.5 °F | 79.9 °F | 3.29 in. |
| August | 55.5 °F | 78.7 °F | 3.48 in. |
| September | 47.5 °F | 71.2 °F | 3.65 in. |
| October | 36.6 °F | 58.1 °F | 4.78 in. |
| November | 27.2 °F | 45.0 °F | 4.14 in. |
| December | 15.4 °F | 33.5 °F | 4.14 in. |
| Annual | 33.1 °F | 54.8 °F | 44.59 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |