Slave Lake, Alberta climate data is summarized below. Average annual temperatures range from -2.1 °C (low) to 7 °C (high). Annual precipitation averages 403 Millimeters. 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 | -14.7 °C | -6.83 °C | 0 mm |
| February | -14.32 °C | -5.5 °C | 0 mm |
| March | -10.11 °C | -0.6 °C | 0 mm |
| April | -2.6 °C | 6.78 °C | 21 mm |
| May | 3.42 °C | 15.09 °C | 60 mm |
| June | 8.58 °C | 19.2 °C | 81 mm |
| July | 11.47 °C | 21.66 °C | 101 mm |
| August | 10.18 °C | 20.51 °C | 59 mm |
| September | 5.63 °C | 15.91 °C | 46 mm |
| October | 0.72 °C | 8.26 °C | 35 mm |
| November | -7.28 °C | -1.62 °C | 0 mm |
| December | -15.78 °C | -8.78 °C | 0 mm |
| Annual | -2.1 °C | 7 °C | 403 mm |
| 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°C to -37.2°C |
| Current Drought Conditions | Normal |