Halstad, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.8 °F (low) to 50.8 °F (high). Annual precipitation averages 23.5 Inches. 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 | -1.8 °F | 15.5 °F | 0.67 in. |
| February | 2.1 °F | 20.8 °F | 0.61 in. |
| March | 15.9 °F | 33.7 °F | 0.89 in. |
| April | 31.1 °F | 52.1 °F | 1.32 in. |
| May | 43.8 °F | 66.4 °F | 2.84 in. |
| June | 55.4 °F | 76.0 °F | 4.19 in. |
| July | 58.9 °F | 80.5 °F | 3.64 in. |
| August | 55.7 °F | 79.4 °F | 2.73 in. |
| September | 46.9 °F | 71.0 °F | 2.89 in. |
| October | 34.7 °F | 55.3 °F | 2.13 in. |
| November | 20.2 °F | 37.3 °F | 0.8 in. |
| December | 6.5 °F | 21.9 °F | 0.81 in. |
| Annual | 30.8 °F | 50.8 °F | 23.52 in. |
| 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 : -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 |