Port Perry, Ontario climate data is summarized below. Average annual temperatures range from 36 °F (low) to 53.8 °F (high). Annual precipitation averages 35 Inches. 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 | -23.8 °F | -19.3 °F | 431.8 in. |
| February | -24.5 °F | -19.5 °F | 177.8 in. |
| March | -21.2 °F | -15.8 °F | 1371.6 in. |
| April | -17.1 °F | -11.2 °F | 2159 in. |
| May | -13.7 °F | -7.1 °F | 2641.6 in. |
| June | -10.9 °F | -4.6 °F | 3048 in. |
| July | -9.5 °F | -3.2 °F | 2921 in. |
| August | -9.9 °F | -3.7 °F | 3352.8 in. |
| September | -12.5 °F | -6.2 °F | 2057.4 in. |
| October | -15.3 °F | -10.3 °F | 1955.8 in. |
| November | -18.5 °F | -13.9 °F | 1397 in. |
| December | -21.5 °F | -17.8 °F | 1066.8 in. |
| Annual | 36 °F | 53.8 °F | 35.01 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |