Summerside, Prince Edward Island climate data is summarized below. Average annual temperatures range from 36.7 °F (low) to 49.9 °F (high). Annual precipitation averages 35.3 Inches. 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 | -23.4 °F | -19.4 °F | 609.6 in. |
| February | -23.7 °F | -19.4 °F | 0 in. |
| March | -21.7 °F | -17.6 °F | 762 in. |
| April | -18.1 °F | -14.1 °F | 1600.2 in. |
| May | -14.8 °F | -10.4 °F | 1981.2 in. |
| June | -11.9 °F | -7.5 °F | 2438.4 in. |
| July | -9.2 °F | -4.7 °F | 2514.6 in. |
| August | -9.3 °F | -4.9 °F | 2743.2 in. |
| September | -11.6 °F | -7.2 °F | 2743.2 in. |
| October | -14.4 °F | -10.6 °F | 2565.4 in. |
| November | -17.2 °F | -13.9 °F | 2514.6 in. |
| December | -20.6 °F | -17.3 °F | 2311.4 in. |
| Annual | 36.7 °F | 49.9 °F | 35.31 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 | Abnormally Dry |