Wausau, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 52.9 °F (high). Annual precipitation averages 34.2 Inches. 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 | 5.8 °F | 22.7 °F | 1.23 in. |
| February | 7.6 °F | 26.9 °F | 1.08 in. |
| March | 18.8 °F | 38.8 °F | 1.78 in. |
| April | 31.8 °F | 52.9 °F | 3.09 in. |
| May | 44.4 °F | 66.0 °F | 3.71 in. |
| June | 54.4 °F | 75.5 °F | 4.64 in. |
| July | 58.2 °F | 79.7 °F | 3.86 in. |
| August | 56.2 °F | 77.6 °F | 4.14 in. |
| September | 48.1 °F | 69.7 °F | 3.93 in. |
| October | 36.1 °F | 55.9 °F | 3.11 in. |
| November | 24.7 °F | 40.8 °F | 2.02 in. |
| December | 13.0 °F | 28.0 °F | 1.58 in. |
| Annual | 33.3 °F | 52.9 °F | 34.17 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 5a : -20°F to -15°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 |