Walkerton, Ontario climate data is summarized below. Average annual temperatures range from 2.5 °C (low) to 11.9 °C (high). Annual precipitation averages 671 Millimeters. Walkerton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.76 °C | -2.86 °C | 0 mm |
| February | -11.27 °C | -3.41 °C | 0 mm |
| March | -5.73 °C | 3.43 °C | 33 mm |
| April | 0.94 °C | 11.61 °C | 63 mm |
| May | 7.08 °C | 18.91 °C | 90 mm |
| June | 12.02 °C | 23.37 °C | 92 mm |
| July | 14.2 °C | 25.52 °C | 73 mm |
| August | 13.82 °C | 24.74 °C | 82 mm |
| September | 9.82 °C | 20.59 °C | 84 mm |
| October | 5.27 °C | 13.75 °C | 97 mm |
| November | -0.26 °C | 6.99 °C | 53 mm |
| December | -5.8 °C | 0.18 °C | 4 mm |
| Annual | 2.5 °C | 11.9 °C | 671 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |