Port Lambton, Ontario climate data is summarized below. Average annual temperatures range from 4.6 °C (low) to 13.9 °C (high). Annual precipitation averages 422 Millimeters. Port Lambton is located in USDA Plant Hardiness Zone 7a. 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 | -7.8 °C | -0.88 °C | 12 mm |
| February | -8.65 °C | -1.08 °C | 4 mm |
| March | -2.79 °C | 6.54 °C | 25 mm |
| April | 2.52 °C | 13.53 °C | 45 mm |
| May | 8.83 °C | 20.29 °C | 56 mm |
| June | 14.08 °C | 25.41 °C | 53 mm |
| July | 16.63 °C | 27.57 °C | 52 mm |
| August | 16.11 °C | 26.62 °C | 52 mm |
| September | 11.75 °C | 22.33 °C | 41 mm |
| October | 6.7 °C | 15.71 °C | 32 mm |
| November | 0.96 °C | 8.62 °C | 30 mm |
| December | -3.66 °C | 2.29 °C | 20 mm |
| Annual | 4.6 °C | 13.9 °C | 422 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |