Halstad, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.7 °C (low) to 10.4 °C (high). Annual precipitation averages 597.4 Millimeters. Halstad 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.8 °C | -9.2 °C | 17.02 mm |
| February | -16.6 °C | -6.2 °C | 15.49 mm |
| March | -8.9 °C | 0.9 °C | 22.61 mm |
| April | -0.5 °C | 11.2 °C | 33.53 mm |
| May | 6.6 °C | 19.1 °C | 72.14 mm |
| June | 13 °C | 24.4 °C | 106.43 mm |
| July | 14.9 °C | 26.9 °C | 92.46 mm |
| August | 13.2 °C | 26.3 °C | 69.34 mm |
| September | 8.3 °C | 21.7 °C | 73.41 mm |
| October | 1.5 °C | 12.9 °C | 54.1 mm |
| November | -6.6 °C | 2.9 °C | 20.32 mm |
| December | -14.2 °C | -5.6 °C | 20.57 mm |
| Annual | -0.7 °C | 10.4 °C | 597.42 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |