Plum City, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35 °F (low) to 54.8 °F (high). Annual precipitation averages 35.3 Inches. Plum City 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.6 °F | 23.5 °F | 0.99 in. |
| February | 9.1 °F | 28.5 °F | 1.06 in. |
| March | 21.5 °F | 40.9 °F | 1.86 in. |
| April | 34.1 °F | 55.8 °F | 3.16 in. |
| May | 46.4 °F | 68.2 °F | 4.45 in. |
| June | 56.8 °F | 77.6 °F | 5.31 in. |
| July | 60.9 °F | 81.9 °F | 4.2 in. |
| August | 58.6 °F | 79.7 °F | 4.73 in. |
| September | 50.5 °F | 72.5 °F | 3.82 in. |
| October | 37.9 °F | 58.5 °F | 2.65 in. |
| November | 25.4 °F | 42.1 °F | 1.75 in. |
| December | 13.3 °F | 28.8 °F | 1.32 in. |
| Annual | 35 °F | 54.8 °F | 35.3 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |