Hendrum, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.1 °F (low) to 51.1 °F (high). Annual precipitation averages 23.6 Inches. Hendrum 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 | -1.5 °F | 15.9 °F | 0.67 in. |
| February | 2.6 °F | 21.3 °F | 0.63 in. |
| March | 16.2 °F | 34.2 °F | 0.93 in. |
| April | 31.3 °F | 52.3 °F | 1.31 in. |
| May | 44.1 °F | 66.7 °F | 2.92 in. |
| June | 55.5 °F | 76.2 °F | 4.16 in. |
| July | 59.1 °F | 80.7 °F | 3.58 in. |
| August | 56.1 °F | 79.6 °F | 2.74 in. |
| September | 47.3 °F | 71.3 °F | 2.86 in. |
| October | 35.0 °F | 55.5 °F | 2.15 in. |
| November | 20.4 °F | 37.3 °F | 0.81 in. |
| December | 6.9 °F | 22.4 °F | 0.81 in. |
| Annual | 31.1 °F | 51.1 °F | 23.57 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 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |