Aniwa, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.4 °F (low) to 51.7 °F (high). Annual precipitation averages 32.4 Inches. Aniwa 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 | 4.0 °F | 21.8 °F | 1.1 in. |
| February | 5.4 °F | 26.0 °F | 0.99 in. |
| March | 16.6 °F | 37.6 °F | 1.61 in. |
| April | 29.9 °F | 51.3 °F | 2.93 in. |
| May | 42.4 °F | 64.6 °F | 3.67 in. |
| June | 52.4 °F | 73.9 °F | 4.48 in. |
| July | 56.0 °F | 78.1 °F | 3.76 in. |
| August | 54.1 °F | 76.4 °F | 3.64 in. |
| September | 46.3 °F | 68.9 °F | 3.75 in. |
| October | 34.8 °F | 54.6 °F | 3.07 in. |
| November | 24.0 °F | 39.9 °F | 1.87 in. |
| December | 11.4 °F | 27.0 °F | 1.49 in. |
| Annual | 31.4 °F | 51.7 °F | 32.36 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |