Neillsville, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 12.5 °C (high). Annual precipitation averages 890.3 Millimeters. Neillsville is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.1 °C | -4.6 °C | 28.45 mm |
| February | -13.4 °C | -1.7 °C | 26.92 mm |
| March | -6.9 °C | 5 °C | 42.42 mm |
| April | -0.1 °C | 12.9 °C | 81.79 mm |
| May | 6.5 °C | 19.9 °C | 108.2 mm |
| June | 12.1 °C | 24.9 °C | 132.33 mm |
| July | 14.2 °C | 27.1 °C | 103.63 mm |
| August | 13.1 °C | 26 °C | 108.97 mm |
| September | 8.4 °C | 21.8 °C | 102.87 mm |
| October | 2.1 °C | 14.4 °C | 72.64 mm |
| November | -4.3 °C | 5.7 °C | 46.23 mm |
| December | -11.1 °C | -1.7 °C | 35.81 mm |
| Annual | 0.5 °C | 12.5 °C | 890.26 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |