Summerside, Prince Edward Island climate data is summarized below. Average annual temperatures range from 2.6 °C (low) to 10 °C (high). Annual precipitation averages 897 Millimeters. Summerside 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 | -10.04 °C | -2.92 °C | 24 mm |
| February | -10.6 °C | -2.95 °C | 0 mm |
| March | -7.1 °C | 0.28 °C | 30 mm |
| April | -0.64 °C | 6.7 °C | 63 mm |
| May | 5.39 °C | 13.35 °C | 78 mm |
| June | 10.59 °C | 18.54 °C | 96 mm |
| July | 15.36 °C | 23.47 °C | 99 mm |
| August | 15.18 °C | 23.19 °C | 108 mm |
| September | 11.19 °C | 18.99 °C | 108 mm |
| October | 6.12 °C | 12.91 °C | 101 mm |
| November | 0.99 °C | 6.95 °C | 99 mm |
| December | -5.1 °C | 0.92 °C | 91 mm |
| Annual | 2.6 °C | 10 °C | 897 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 | Abnormally Dry |