Slave Lake, Alberta climate data is summarized below. Average annual temperatures range from 28.3 °F (low) to 44.6 °F (high). Annual precipitation averages 15.9 Inches. Slave Lake is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -25.9 °F | -21.6 °F | 0 in. |
| February | -25.7 °F | -20.8 °F | 0 in. |
| March | -23.4 °F | -18.1 °F | 0 in. |
| April | -19.2 °F | -14 °F | 533.4 in. |
| May | -15.9 °F | -9.4 °F | 1524 in. |
| June | -13 °F | -7.1 °F | 2057.4 in. |
| July | -11.4 °F | -5.7 °F | 2565.4 in. |
| August | -12.1 °F | -6.4 °F | 1498.6 in. |
| September | -14.7 °F | -8.9 °F | 1168.4 in. |
| October | -17.4 °F | -13.2 °F | 889 in. |
| November | -21.8 °F | -18.7 °F | 0 in. |
| December | -26.5 °F | -22.7 °F | 0 in. |
| Annual | 28.3 °F | 44.6 °F | 15.87 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°F to -35°F |
| Current Drought Conditions | Normal |