Willernie, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.8 °F (low) to 54.4 °F (high). Annual precipitation averages 34.4 Inches. Willernie is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.4 °F | 23.1 °F | 0.98 in. |
| February | 9.6 °F | 28.1 °F | 0.93 in. |
| March | 21.5 °F | 40.7 °F | 1.72 in. |
| April | 34.7 °F | 55.1 °F | 3.19 in. |
| May | 47.4 °F | 67.6 °F | 4.29 in. |
| June | 57.8 °F | 77.3 °F | 4.91 in. |
| July | 62.6 °F | 81.7 °F | 4.33 in. |
| August | 59.9 °F | 79.4 °F | 4.56 in. |
| September | 51.5 °F | 71.8 °F | 3.49 in. |
| October | 38.5 °F | 57.5 °F | 3.04 in. |
| November | 25.8 °F | 42.0 °F | 1.66 in. |
| December | 13.5 °F | 28.3 °F | 1.32 in. |
| Annual | 35.8 °F | 54.4 °F | 34.42 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |