Port Colborne, Ontario climate data is summarized below. Average annual temperatures range from 41.6 °F (low) to 55.2 °F (high). Annual precipitation averages 33 Inches. Port Colborne is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -21.6 °F | -18.1 °F | 685.8 in. |
| February | -22.6 °F | -18.6 °F | 533.4 in. |
| March | -19.6 °F | -15.1 °F | 1447.8 in. |
| April | -16.5 °F | -11.5 °F | 1981.2 in. |
| May | -13 °F | -7.8 °F | 2260.6 in. |
| June | -9.7 °F | -5 °F | 2209.8 in. |
| July | -7.9 °F | -3.6 °F | 2057.4 in. |
| August | -8 °F | -3.7 °F | 1803.4 in. |
| September | -10.2 °F | -5.8 °F | 2336.8 in. |
| October | -13.2 °F | -9.4 °F | 2590.8 in. |
| November | -16.5 °F | -12.8 °F | 1803.4 in. |
| December | -19.1 °F | -16.1 °F | 1574.8 in. |
| Annual | 41.6 °F | 55.2 °F | 33 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |