Henning, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 10.4 °C (high). Annual precipitation averages 660.7 Millimeters. Henning 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.1 °C | -7.8 °C | 16.51 mm |
| February | -16.3 °C | -4.9 °C | 16 mm |
| March | -8.8 °C | 2.2 °C | 29.46 mm |
| April | -1 °C | 11 °C | 53.09 mm |
| May | 6.4 °C | 18.4 °C | 85.85 mm |
| June | 12.4 °C | 23.6 °C | 107.95 mm |
| July | 15 °C | 26.1 °C | 100.08 mm |
| August | 13.4 °C | 25.2 °C | 75.95 mm |
| September | 8.9 °C | 20.8 °C | 68.33 mm |
| October | 1.7 °C | 12.3 °C | 64.52 mm |
| November | -6.1 °C | 2.9 °C | 22.86 mm |
| December | -13.6 °C | -4.7 °C | 20.07 mm |
| Annual | -0.5 °C | 10.4 °C | 660.67 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 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |