Benson, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 53.9 °F (high). Annual precipitation averages 27.2 Inches. Benson 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 | 2.8 °F | 20.9 °F | 0.64 in. |
| February | 6.1 °F | 25.6 °F | 0.68 in. |
| March | 19.4 °F | 38.2 °F | 1.33 in. |
| April | 32.7 °F | 54.8 °F | 2.4 in. |
| May | 45.9 °F | 68.4 °F | 3.23 in. |
| June | 57.0 °F | 78.1 °F | 4.23 in. |
| July | 60.7 °F | 82.0 °F | 4.07 in. |
| August | 57.6 °F | 80.0 °F | 3.76 in. |
| September | 49.2 °F | 73.1 °F | 2.67 in. |
| October | 36.0 °F | 58.2 °F | 2.35 in. |
| November | 22.6 °F | 40.9 °F | 1.1 in. |
| December | 9.9 °F | 26.6 °F | 0.76 in. |
| Annual | 33.3 °F | 53.9 °F | 27.22 in. |
| 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 : -25°F to -20°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 |