Port Hope, Ontario climate data is summarized below. Average annual temperatures range from 3.7 °C (low) to 11.5 °C (high). Annual precipitation averages 608 Millimeters. Port Hope is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.68 °C | -1.22 °C | 11 mm |
| February | -9.81 °C | -1.67 °C | 6 mm |
| March | -4.09 °C | 3.74 °C | 43 mm |
| April | 1.93 °C | 9.73 °C | 67 mm |
| May | 7.36 °C | 15.83 °C | 63 mm |
| June | 12.76 °C | 20.7 °C | 71 mm |
| July | 15.57 °C | 23.83 °C | 83 mm |
| August | 15.5 °C | 23.83 °C | 86 mm |
| September | 11.44 °C | 20.24 °C | 44 mm |
| October | 6.36 °C | 13.84 °C | 50 mm |
| November | 0.47 °C | 7.63 °C | 47 mm |
| December | -4.8 °C | 1.4 °C | 37 mm |
| Annual | 3.7 °C | 11.5 °C | 608 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |