Wadena, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.6 °F (low) to 50.5 °F (high). Annual precipitation averages 27.4 Inches. Wadena is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.9 °F | 17.9 °F | 0.68 in. |
| February | 2.4 °F | 23.1 °F | 0.7 in. |
| March | 15.9 °F | 35.8 °F | 1.25 in. |
| April | 29.8 °F | 51.7 °F | 2.21 in. |
| May | 43.0 °F | 64.9 °F | 3.51 in. |
| June | 53.8 °F | 73.8 °F | 4.29 in. |
| July | 58.2 °F | 78.7 °F | 4.28 in. |
| August | 55.4 °F | 77.2 °F | 3.05 in. |
| September | 47.0 °F | 68.8 °F | 2.75 in. |
| October | 34.1 °F | 53.8 °F | 2.75 in. |
| November | 21.0 °F | 37.2 °F | 1.1 in. |
| December | 7.4 °F | 23.4 °F | 0.8 in. |
| Annual | 30.6 °F | 50.5 °F | 27.37 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |