Gananoque, Ontario climate data is summarized below. Average annual temperatures range from 39 °F (low) to 53.7 °F (high). Annual precipitation averages 32.9 Inches. Gananoque is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -23.5 °F | -19 °F | 330.2 in. |
| February | -24 °F | -19.3 °F | 279.4 in. |
| March | -20.5 °F | -15.7 °F | 1320.8 in. |
| April | -16.5 °F | -11.5 °F | 2413 in. |
| May | -13.1 °F | -7.6 °F | 2184.4 in. |
| June | -10.1 °F | -5.3 °F | 2413 in. |
| July | -8.3 °F | -3.8 °F | 2184.4 in. |
| August | -8.5 °F | -3.9 °F | 2006.6 in. |
| September | -10.8 °F | -6.2 °F | 2006.6 in. |
| October | -13.9 °F | -9.9 °F | 2794 in. |
| November | -17.2 °F | -13.4 °F | 1854.2 in. |
| December | -21 °F | -17.4 °F | 1447.8 in. |
| Annual | 39 °F | 53.7 °F | 32.91 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |