Hallock, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.9 °C (low) to 9.3 °C (high). Annual precipitation averages 562.4 Millimeters. Hallock 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.3 °C | -10.7 °C | 15.75 mm |
| February | -18.5 °C | -7.9 °C | 11.68 mm |
| March | -10.6 °C | -0.6 °C | 19.81 mm |
| April | -1.4 °C | 10.2 °C | 27.18 mm |
| May | 5.4 °C | 18.3 °C | 80.77 mm |
| June | 11.9 °C | 23.7 °C | 106.43 mm |
| July | 13.8 °C | 26.2 °C | 84.33 mm |
| August | 12.2 °C | 25.8 °C | 68.58 mm |
| September | 7.3 °C | 20.8 °C | 58.42 mm |
| October | 0.6 °C | 11.5 °C | 43.94 mm |
| November | -7.5 °C | 1.3 °C | 23.88 mm |
| December | -15.6 °C | -7 °C | 21.59 mm |
| Annual | -1.9 °C | 9.3 °C | 562.36 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |