Marshfield, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.1 °F (low) to 53.2 °F (high). Annual precipitation averages 31.7 Inches. 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 | 5.9 °F | 22.8 °F | 1.07 in. |
| February | 8.5 °F | 27.2 °F | 0.97 in. |
| March | 20.3 °F | 39.4 °F | 1.69 in. |
| April | 32.9 °F | 53.6 °F | 3.06 in. |
| May | 45.4 °F | 66.3 °F | 3.63 in. |
| June | 55.3 °F | 75.4 °F | 4.4 in. |
| July | 59.2 °F | 80.0 °F | 3.5 in. |
| August | 57.3 °F | 77.8 °F | 3.65 in. |
| September | 48.9 °F | 70.3 °F | 3.49 in. |
| October | 36.7 °F | 56.7 °F | 2.95 in. |
| November | 25.3 °F | 41.1 °F | 1.86 in. |
| December | 13.3 °F | 28.2 °F | 1.42 in. |
| Annual | 34.1 °F | 53.2 °F | 31.69 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |