Lake Henry, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.1 °F (low) to 52.7 °F (high). Annual precipitation averages 28.7 Inches. Lake Henry 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 | 2.4 °F | 20.3 °F | 0.72 in. |
| February | 5.8 °F | 25.2 °F | 0.77 in. |
| March | 18.6 °F | 37.5 °F | 1.46 in. |
| April | 32.3 °F | 53.4 °F | 2.47 in. |
| May | 45.3 °F | 66.8 °F | 3.37 in. |
| June | 56.0 °F | 76.7 °F | 4.38 in. |
| July | 60.6 °F | 81.1 °F | 4.2 in. |
| August | 57.9 °F | 78.8 °F | 3.81 in. |
| September | 49.1 °F | 71.2 °F | 2.78 in. |
| October | 36.1 °F | 56.2 °F | 2.54 in. |
| November | 22.9 °F | 39.1 °F | 1.29 in. |
| December | 9.9 °F | 25.7 °F | 0.92 in. |
| Annual | 33.1 °F | 52.7 °F | 28.71 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 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |