Bena, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.7 °F (low) to 50.4 °F (high). Annual precipitation averages 26.7 Inches. Bena is located in USDA Plant Hardiness Zone 3b. 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 | -2.2 °F | 17.6 °F | 0.73 in. |
| February | 1.0 °F | 24.1 °F | 0.68 in. |
| March | 14.6 °F | 37.0 °F | 1.14 in. |
| April | 28.6 °F | 51.3 °F | 1.88 in. |
| May | 41.6 °F | 65.2 °F | 2.99 in. |
| June | 52.3 °F | 74.2 °F | 4.13 in. |
| July | 57.2 °F | 78.7 °F | 4.23 in. |
| August | 54.8 °F | 77.0 °F | 3.28 in. |
| September | 46.6 °F | 68.2 °F | 3.08 in. |
| October | 34.4 °F | 52.9 °F | 2.52 in. |
| November | 21.1 °F | 36.0 °F | 1.16 in. |
| December | 6.7 °F | 22.9 °F | 0.91 in. |
| Annual | 29.7 °F | 50.4 °F | 26.73 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 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |