Aniwa, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 10.9 °C (high). Annual precipitation averages 822 Millimeters. 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 | -15.6 °C | -5.7 °C | 27.94 mm |
| February | -14.8 °C | -3.3 °C | 25.15 mm |
| March | -8.6 °C | 3.1 °C | 40.89 mm |
| April | -1.2 °C | 10.7 °C | 74.42 mm |
| May | 5.8 °C | 18.1 °C | 93.22 mm |
| June | 11.3 °C | 23.3 °C | 113.79 mm |
| July | 13.3 °C | 25.6 °C | 95.5 mm |
| August | 12.3 °C | 24.7 °C | 92.46 mm |
| September | 7.9 °C | 20.5 °C | 95.25 mm |
| October | 1.6 °C | 12.6 °C | 77.98 mm |
| November | -4.4 °C | 4.4 °C | 47.5 mm |
| December | -11.4 °C | -2.8 °C | 37.85 mm |
| Annual | -0.3 °C | 10.9 °C | 821.95 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |