Wausau, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 11.6 °C (high). Annual precipitation averages 867.9 Millimeters. Wausau is located in USDA Plant Hardiness Zone 5a. 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 | -14.6 °C | -5.2 °C | 31.24 mm |
| February | -13.6 °C | -2.8 °C | 27.43 mm |
| March | -7.3 °C | 3.8 °C | 45.21 mm |
| April | -0.1 °C | 11.6 °C | 78.49 mm |
| May | 6.9 °C | 18.9 °C | 94.23 mm |
| June | 12.4 °C | 24.2 °C | 117.86 mm |
| July | 14.6 °C | 26.5 °C | 98.04 mm |
| August | 13.4 °C | 25.3 °C | 105.16 mm |
| September | 8.9 °C | 20.9 °C | 99.82 mm |
| October | 2.3 °C | 13.3 °C | 78.99 mm |
| November | -4.1 °C | 4.9 °C | 51.31 mm |
| December | -10.6 °C | -2.2 °C | 40.13 mm |
| Annual | 0.7 °C | 11.6 °C | 867.91 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 5a : -28.9°C to -26.1°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 |