King City, Ontario climate data is summarized below. Average annual temperatures range from 3 °C (low) to 12.4 °C (high). Annual precipitation averages 871 Millimeters. King City 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 | -9.71 °C | -2.19 °C | 16 mm |
| February | -10.78 °C | -2.62 °C | 11 mm |
| March | -5.32 °C | 4.19 °C | 52 mm |
| April | 1.48 °C | 11.67 °C | 85 mm |
| May | 7.73 °C | 19.1 °C | 110 mm |
| June | 12.86 °C | 23.79 °C | 113 mm |
| July | 15.5 °C | 26.41 °C | 125 mm |
| August | 14.9 °C | 25.46 °C | 112 mm |
| September | 10.52 °C | 20.95 °C | 78 mm |
| October | 5.29 °C | 13.7 °C | 72 mm |
| November | -0.53 °C | 7.12 °C | 56 mm |
| December | -5.73 °C | 0.56 °C | 41 mm |
| Annual | 3 °C | 12.4 °C | 871 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 |