Kelliher, Minnesota has a Humid Continental Mild Summer With Dry Winters climate (Köppen classification: Dwb). Average annual temperatures range from -2.1 °C (low) to 9.8 °C (high). Annual precipitation averages 654.6 Millimeters. Kelliher is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -19.9 °C | -8.3 °C | 17.27 mm |
| February | -18.6 °C | -5.2 °C | 16.26 mm |
| March | -10.5 °C | 2.5 °C | 24.13 mm |
| April | -2.4 °C | 10.2 °C | 41.66 mm |
| May | 4.8 °C | 18.1 °C | 73.41 mm |
| June | 10.7 °C | 22.7 °C | 107.7 mm |
| July | 12.9 °C | 25.2 °C | 100.33 mm |
| August | 11.5 °C | 24.6 °C | 83.31 mm |
| September | 6.9 °C | 19.8 °C | 74.42 mm |
| October | 0.8 °C | 11.4 °C | 64.26 mm |
| November | -6.8 °C | 1.9 °C | 30.23 mm |
| December | -14.9 °C | -5.2 °C | 21.59 mm |
| Annual | -2.1 °C | 9.8 °C | 654.57 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dwb - Humid Continental Mild Summer With Dry Winters |