Port Perry, Ontario climate data is summarized below. Average annual temperatures range from 2.2 °C (low) to 12.1 °C (high). Annual precipitation averages 889 Millimeters. Port Perry is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.91 °C | -2.65 °C | 17 mm |
| February | -12.14 °C | -3.1 °C | 7 mm |
| March | -6.13 °C | 3.54 °C | 54 mm |
| April | 1.15 °C | 11.77 °C | 85 mm |
| May | 7.41 °C | 19.21 °C | 104 mm |
| June | 12.43 °C | 23.73 °C | 120 mm |
| July | 14.88 °C | 26.27 °C | 115 mm |
| August | 14.13 °C | 25.27 °C | 132 mm |
| September | 9.5 °C | 20.79 °C | 81 mm |
| October | 4.5 °C | 13.55 °C | 77 mm |
| November | -1.33 °C | 6.9 °C | 55 mm |
| December | -6.77 °C | 0.01 °C | 42 mm |
| Annual | 2.2 °C | 12.1 °C | 889 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |