Walker, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1 °C (low) to 9.8 °C (high). Annual precipitation averages 702.1 Millimeters. Walker 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 | -18.7 °C | -8 °C | 17.78 mm |
| February | -17.1 °C | -4.8 °C | 18.29 mm |
| March | -9.4 °C | 2.3 °C | 31.5 mm |
| April | -1.6 °C | 10.2 °C | 54.36 mm |
| May | 5.7 °C | 17.6 °C | 81.28 mm |
| June | 11.6 °C | 22.8 °C | 109.98 mm |
| July | 14.3 °C | 25.3 °C | 106.93 mm |
| August | 12.9 °C | 24.4 °C | 78.99 mm |
| September | 8.2 °C | 19.5 °C | 78.99 mm |
| October | 1.4 °C | 11.3 °C | 69.34 mm |
| November | -5.8 °C | 2.3 °C | 30.73 mm |
| December | -13.8 °C | -5.1 °C | 23.88 mm |
| Annual | -1 °C | 9.8 °C | 702.05 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |