Port Carling, Ontario climate data is summarized below. Average annual temperatures range from 0.5 °C (low) to 10.8 °C (high). Annual precipitation averages 701 Millimeters. Port Carling is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.73 °C | -4.2 °C | 0 mm |
| February | -15.32 °C | -4.36 °C | 0 mm |
| March | -8.48 °C | 2.19 °C | 31 mm |
| April | -1.25 °C | 10 °C | 67 mm |
| May | 5.19 °C | 17.45 °C | 76 mm |
| June | 10.69 °C | 22.01 °C | 86 mm |
| July | 13.52 °C | 24.56 °C | 88 mm |
| August | 13.1 °C | 23.98 °C | 87 mm |
| September | 9.01 °C | 19.78 °C | 82 mm |
| October | 4.17 °C | 12.88 °C | 109 mm |
| November | -1.67 °C | 6.21 °C | 63 mm |
| December | -8.88 °C | -1.3 °C | 12 mm |
| Annual | 0.5 °C | 10.8 °C | 701 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |