Smithers, British Columbia climate data is summarized below. Average annual temperatures range from 30.3 °F (low) to 44.1 °F (high). Annual precipitation averages 16.5 Inches. Smithers is located in USDA Plant Hardiness Zone 4b. 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 | -22.5 °F | -19 °F | 0 in. |
| February | -22.5 °F | -18.6 °F | 0 in. |
| March | -22.2 °F | -17.4 °F | 0 in. |
| April | -19.2 °F | -14.8 °F | 660.4 in. |
| May | -16.6 °F | -11.6 °F | 1397 in. |
| June | -14.5 °F | -9.6 °F | 1778 in. |
| July | -12.9 °F | -7.7 °F | 1549.4 in. |
| August | -13.4 °F | -7.7 °F | 1346.2 in. |
| September | -15.2 °F | -10.4 °F | 1574.8 in. |
| October | -17.5 °F | -14.2 °F | 2286 in. |
| November | -20.4 °F | -17.8 °F | 25.4 in. |
| December | -23 °F | -19.8 °F | 0 in. |
| Annual | 30.3 °F | 44.1 °F | 16.46 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |