Donaldson, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.7 °C (low) to 9.4 °C (high). Annual precipitation averages 576.1 Millimeters. Donaldson is located in USDA Plant Hardiness Zone 4a. 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 °C | -10.4 °C | 15.24 mm |
| February | -18.3 °C | -7.7 °C | 12.95 mm |
| March | -10.3 °C | -0.3 °C | 20.32 mm |
| April | -1.3 °C | 10.1 °C | 28.7 mm |
| May | 5.6 °C | 18.3 °C | 80.77 mm |
| June | 12.1 °C | 23.7 °C | 104.9 mm |
| July | 14 °C | 26.3 °C | 86.87 mm |
| August | 12.3 °C | 25.9 °C | 71.63 mm |
| September | 7.3 °C | 20.9 °C | 60.2 mm |
| October | 0.7 °C | 11.7 °C | 48.26 mm |
| November | -7.4 °C | 1.4 °C | 24.89 mm |
| December | -15.3 °C | -6.8 °C | 21.34 mm |
| Annual | -1.7 °C | 9.4 °C | 576.07 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 4a : -34.4°C to -31.7°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 |