McGregor, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.9 °F (low) to 51 °F (high). Annual precipitation averages 29.9 Inches. McGregor 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 | -0.4 °F | 19.4 °F | 0.77 in. |
| February | 2.8 °F | 25.2 °F | 0.73 in. |
| March | 15.6 °F | 37.7 °F | 1.31 in. |
| April | 29.1 °F | 51.2 °F | 2.36 in. |
| May | 41.2 °F | 64.8 °F | 3.56 in. |
| June | 51.1 °F | 74.2 °F | 4.61 in. |
| July | 55.7 °F | 78.6 °F | 4.48 in. |
| August | 53.4 °F | 76.4 °F | 3.69 in. |
| September | 45.5 °F | 68.5 °F | 3.11 in. |
| October | 34.2 °F | 53.9 °F | 2.86 in. |
| November | 21.8 °F | 37.7 °F | 1.37 in. |
| December | 8.4 °F | 24.7 °F | 1.05 in. |
| Annual | 29.9 °F | 51 °F | 29.9 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |