Marinette, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 11.7 °C (high). Annual precipitation averages 819.4 Millimeters. Marinette is located in USDA Plant Hardiness Zone 5b. 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 | -12.2 °C | -3.6 °C | 40.13 mm |
| February | -11.7 °C | -1.9 °C | 30.73 mm |
| March | -6.3 °C | 3.6 °C | 46.48 mm |
| April | 0.2 °C | 10.1 °C | 73.41 mm |
| May | 6.8 °C | 17.4 °C | 88.65 mm |
| June | 12.6 °C | 23.1 °C | 93.47 mm |
| July | 15.2 °C | 25.9 °C | 96.77 mm |
| August | 14.4 °C | 25.1 °C | 81.53 mm |
| September | 10.2 °C | 20.9 °C | 83.06 mm |
| October | 3.9 °C | 13.6 °C | 84.58 mm |
| November | -1.9 °C | 6.2 °C | 54.36 mm |
| December | -8.1 °C | -0.4 °C | 46.23 mm |
| Annual | 1.9 °C | 11.7 °C | 819.4 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |