Kingston, Ontario climate data is summarized below. Average annual temperatures range from 4.3 °C (low) to 11.6 °C (high). Annual precipitation averages 556 Millimeters. Kingston is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.41 °C | -1.96 °C | 9 mm |
| February | -10.73 °C | -2.59 °C | 4 mm |
| March | -4.64 °C | 3.26 °C | 41 mm |
| April | 2.2 °C | 9.84 °C | 66 mm |
| May | 8.37 °C | 16.67 °C | 58 mm |
| June | 13.91 °C | 21.19 °C | 66 mm |
| July | 17.36 °C | 24.31 °C | 70 mm |
| August | 17.25 °C | 24.37 °C | 57 mm |
| September | 13.11 °C | 20.54 °C | 47 mm |
| October | 7.38 °C | 14.15 °C | 64 mm |
| November | 1.45 °C | 8.02 °C | 43 mm |
| December | -4.66 °C | 1.39 °C | 31 mm |
| Annual | 4.3 °C | 11.6 °C | 556 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |