Northport, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.3 °F (low) to 55 °F (high). Annual precipitation averages 33.9 Inches. Northport is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.0 °F | 25.3 °F | 1.35 in. |
| February | 11.0 °F | 29.3 °F | 1.19 in. |
| March | 21.5 °F | 40.8 °F | 1.9 in. |
| April | 33.4 °F | 54.8 °F | 3.26 in. |
| May | 45.7 °F | 67.5 °F | 3.88 in. |
| June | 55.7 °F | 77.2 °F | 4.66 in. |
| July | 59.8 °F | 81.6 °F | 3.95 in. |
| August | 57.9 °F | 79.5 °F | 3.77 in. |
| September | 49.6 °F | 72.1 °F | 3.38 in. |
| October | 37.8 °F | 58.2 °F | 2.91 in. |
| November | 27.0 °F | 43.5 °F | 1.86 in. |
| December | 15.7 °F | 30.6 °F | 1.75 in. |
| Annual | 35.3 °F | 55 °F | 33.86 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |