Wanamingo, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.6 °C (low) to 12.6 °C (high). Annual precipitation averages 873 Millimeters. Wanamingo is located in USDA Plant Hardiness Zone 4b. 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 | -14.7 °C | -4.9 °C | 23.88 mm |
| February | -12.6 °C | -2.3 °C | 23.62 mm |
| March | -5.7 °C | 4.6 °C | 46.48 mm |
| April | 1.2 °C | 13.3 °C | 79.76 mm |
| May | 8 °C | 20.1 °C | 107.95 mm |
| June | 13.9 °C | 25.3 °C | 137.67 mm |
| July | 15.9 °C | 27.4 °C | 107.7 mm |
| August | 14.6 °C | 26.3 °C | 120.65 mm |
| September | 9.9 °C | 22.6 °C | 92.96 mm |
| October | 2.9 °C | 15.1 °C | 61.47 mm |
| November | -3.8 °C | 5.7 °C | 39.88 mm |
| December | -10.5 °C | -1.8 °C | 30.99 mm |
| Annual | 1.6 °C | 12.6 °C | 873.01 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 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 |