Walkerville, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.8 °C (low) to 10.4 °C (high). Annual precipitation averages 367 Millimeters. Walkerville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 21 - Jun. 30 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.3 °C | -0.2 °C | 19.05 mm |
| February | -11.3 °C | 0.9 °C | 20.32 mm |
| March | -7.1 °C | 4.7 °C | 21.84 mm |
| April | -4.5 °C | 8.2 °C | 38.61 mm |
| May | -0.1 °C | 13.4 °C | 55.63 mm |
| June | 3.6 °C | 18.2 °C | 66.8 mm |
| July | 6.9 °C | 24.6 °C | 26.67 mm |
| August | 6.8 °C | 24.1 °C | 21.08 mm |
| September | 2.4 °C | 18.3 °C | 28.7 mm |
| October | -2.7 °C | 10.4 °C | 28.7 mm |
| November | -6.9 °C | 3.4 °C | 19.3 mm |
| December | -10.6 °C | -1.1 °C | 20.32 mm |
| Annual | -2.8 °C | 10.4 °C | 367.02 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 21 - Jun. 30 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |