Dease Lake, British Columbia climate data is summarized below. Average annual temperatures range from -6.7 °C (low) to 1.1 °C (high). Annual precipitation averages 217 Millimeters. Dease Lake is located in USDA Plant Hardiness Zone 2a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.11 °C | -9 °C | 0 mm |
| February | -16.9 °C | -7.92 °C | 0 mm |
| March | -16.66 °C | -6.66 °C | 0 mm |
| April | -10.37 °C | -1.09 °C | 2 mm |
| May | -1.9 °C | 6.55 °C | 18 mm |
| June | 3.3 °C | 12.44 °C | 38 mm |
| July | 4.7 °C | 13.84 °C | 46 mm |
| August | 4 °C | 13.21 °C | 42 mm |
| September | 0.71 °C | 7.64 °C | 48 mm |
| October | -3.08 °C | 0.99 °C | 23 mm |
| November | -11.66 °C | -6.57 °C | 0 mm |
| December | -16.16 °C | -9.63 °C | 0 mm |
| Annual | -6.7 °C | 1.1 °C | 217 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 2a : -45.6°C to -42.8°C |
| Current Drought Conditions | Normal |