Trenton, Ontario climate data is summarized below. Average annual temperatures range from 37.9 °F (low) to 54.9 °F (high). Annual precipitation averages 29.1 Inches. Trenton 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 | -23.3 °F | -18.6 °F | 381 in. |
| February | -23.8 °F | -18.7 °F | 254 in. |
| March | -20.4 °F | -15.1 °F | 1117.6 in. |
| April | -16.7 °F | -11.1 °F | 1854.2 in. |
| May | -13.3 °F | -7.2 °F | 2108.2 in. |
| June | -10.3 °F | -4.8 °F | 2489.2 in. |
| July | -8.9 °F | -3.2 °F | 2819.4 in. |
| August | -9.2 °F | -3.6 °F | 2590.8 in. |
| September | -11.8 °F | -5.9 °F | 1574.8 in. |
| October | -14.7 °F | -9.7 °F | 1625.6 in. |
| November | -18 °F | -13.3 °F | 1092.2 in. |
| December | -21 °F | -17.1 °F | 838.2 in. |
| Annual | 37.9 °F | 54.9 °F | 29.05 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 |