Port Colborne, Ontario climate data is summarized below. Average annual temperatures range from 5.3 °C (low) to 12.9 °C (high). Annual precipitation averages 838 Millimeters. 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 | -6.91 °C | -0.52 °C | 27 mm |
| February | -8.68 °C | -1.46 °C | 21 mm |
| March | -3.33 °C | 4.83 °C | 57 mm |
| April | 2.31 °C | 11.23 °C | 78 mm |
| May | 8.65 °C | 17.98 °C | 89 mm |
| June | 14.61 °C | 22.94 °C | 87 mm |
| July | 17.83 °C | 25.55 °C | 81 mm |
| August | 17.6 °C | 25.32 °C | 71 mm |
| September | 13.57 °C | 21.55 °C | 92 mm |
| October | 8.17 °C | 15.16 °C | 102 mm |
| November | 2.33 °C | 8.93 °C | 71 mm |
| December | -2.46 °C | 2.96 °C | 62 mm |
| Annual | 5.3 °C | 12.9 °C | 838 mm |
| 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 : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |