Marshfield, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 11.8 °C (high). Annual precipitation averages 804.9 Millimeters. Marshfield is located in USDA Plant Hardiness Zone 4b. 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 | -14.5 °C | -5.1 °C | 27.18 mm |
| February | -13.1 °C | -2.7 °C | 24.64 mm |
| March | -6.5 °C | 4.1 °C | 42.93 mm |
| April | 0.5 °C | 12 °C | 77.72 mm |
| May | 7.4 °C | 19.1 °C | 92.2 mm |
| June | 12.9 °C | 24.1 °C | 111.76 mm |
| July | 15.1 °C | 26.7 °C | 88.9 mm |
| August | 14.1 °C | 25.4 °C | 92.71 mm |
| September | 9.4 °C | 21.3 °C | 88.65 mm |
| October | 2.6 °C | 13.7 °C | 74.93 mm |
| November | -3.7 °C | 5.1 °C | 47.24 mm |
| December | -10.4 °C | -2.1 °C | 36.07 mm |
| Annual | 1.2 °C | 11.8 °C | 804.93 mm |
| 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |