Port Lambton, Ontario climate data is summarized below. Average annual temperatures range from 40.2 °F (low) to 57 °F (high). Annual precipitation averages 16.6 Inches. 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 | -22.1 °F | -18.3 °F | 304.8 in. |
| February | -22.6 °F | -18.4 °F | 101.6 in. |
| March | -19.3 °F | -14.1 °F | 635 in. |
| April | -16.4 °F | -10.3 °F | 1143 in. |
| May | -12.9 °F | -6.5 °F | 1422.4 in. |
| June | -10 °F | -3.7 °F | 1346.2 in. |
| July | -8.5 °F | -2.5 °F | 1320.8 in. |
| August | -8.8 °F | -3 °F | 1320.8 in. |
| September | -11.3 °F | -5.4 °F | 1041.4 in. |
| October | -14.1 °F | -9.1 °F | 812.8 in. |
| November | -17.2 °F | -13 °F | 762 in. |
| December | -19.8 °F | -16.5 °F | 508 in. |
| Annual | 40.2 °F | 57 °F | 16.61 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 7a : 0°F to 5°F |
| Current Drought Conditions | Normal |