Kingston, Ontario climate data is summarized below. Average annual temperatures range from 39.7 °F (low) to 52.9 °F (high). Annual precipitation averages 21.9 Inches. 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 | -23 °F | -18.9 °F | 228.6 in. |
| February | -23.7 °F | -19.2 °F | 101.6 in. |
| March | -20.4 °F | -16 °F | 1041.4 in. |
| April | -16.6 °F | -12.3 °F | 1676.4 in. |
| May | -13.1 °F | -8.5 °F | 1473.2 in. |
| June | -10.1 °F | -6 °F | 1676.4 in. |
| July | -8.1 °F | -4.3 °F | 1778 in. |
| August | -8.2 °F | -4.2 °F | 1447.8 in. |
| September | -10.5 °F | -6.4 °F | 1193.8 in. |
| October | -13.7 °F | -9.9 °F | 1625.6 in. |
| November | -17 °F | -13.3 °F | 1092.2 in. |
| December | -20.4 °F | -17 °F | 787.4 in. |
| Annual | 39.7 °F | 52.9 °F | 21.88 in. |
| 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 : -10°F to -5°F |
| Current Drought Conditions | Normal |