King City, Ontario climate data is summarized below. Average annual temperatures range from 37.4 °F (low) to 54.2 °F (high). Annual precipitation averages 34.3 Inches. 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 | -23.2 °F | -19 °F | 406.4 in. |
| February | -23.8 °F | -19.2 °F | 279.4 in. |
| March | -20.7 °F | -15.5 °F | 1320.8 in. |
| April | -17 °F | -11.3 °F | 2159 in. |
| May | -13.5 °F | -7.2 °F | 2794 in. |
| June | -10.6 °F | -4.6 °F | 2870.2 in. |
| July | -9.2 °F | -3.1 °F | 3175 in. |
| August | -9.5 °F | -3.6 °F | 2844.8 in. |
| September | -11.9 °F | -6.1 °F | 1981.2 in. |
| October | -14.8 °F | -10.2 °F | 1828.8 in. |
| November | -18.1 °F | -13.8 °F | 1422.4 in. |
| December | -21 °F | -17.5 °F | 1041.4 in. |
| Annual | 37.4 °F | 54.2 °F | 34.28 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |