Northport, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39 °F (low) to 52.3 °F (high). Annual precipitation averages 32.3 Inches. Northport is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.8 °F | 28.3 °F | 2.26 in. |
| February | 18.0 °F | 29.4 °F | 1.49 in. |
| March | 23.2 °F | 37.4 °F | 1.97 in. |
| April | 33.2 °F | 47.5 °F | 2.83 in. |
| May | 42.8 °F | 59.7 °F | 2.89 in. |
| June | 53.4 °F | 70.0 °F | 2.95 in. |
| July | 60.5 °F | 75.0 °F | 2.68 in. |
| August | 60.7 °F | 75.4 °F | 2.65 in. |
| September | 54.3 °F | 69.4 °F | 3.45 in. |
| October | 43.6 °F | 56.5 °F | 3.95 in. |
| November | 34.1 °F | 44.5 °F | 2.91 in. |
| December | 25.5 °F | 34.2 °F | 2.25 in. |
| Annual | 39 °F | 52.3 °F | 32.28 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |