Dease Lake, British Columbia climate data is summarized below. Average annual temperatures range from 20 °F (low) to 34.1 °F (high). Annual precipitation averages 8.6 Inches. 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 | -26.7 °F | -22.8 °F | 0 in. |
| February | -27.2 °F | -22.2 °F | 0 in. |
| March | -27 °F | -21.5 °F | 0 in. |
| April | -23.5 °F | -18.4 °F | 50.8 in. |
| May | -18.8 °F | -14.1 °F | 457.2 in. |
| June | -15.9 °F | -10.9 °F | 965.2 in. |
| July | -15.2 °F | -10.1 °F | 1168.4 in. |
| August | -15.6 °F | -10.4 °F | 1066.8 in. |
| September | -17.4 °F | -13.5 °F | 1219.2 in. |
| October | -19.5 °F | -17.2 °F | 584.2 in. |
| November | -24.3 °F | -21.4 °F | 0 in. |
| December | -26.8 °F | -23.1 °F | 0 in. |
| Annual | 20 °F | 34.1 °F | 8.55 in. |
| 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 : -50°F to -45°F |
| Current Drought Conditions | Normal |