Smithers, British Columbia climate data is summarized below. Average annual temperatures range from -1 °C (low) to 6.7 °C (high). Annual precipitation averages 418 Millimeters. 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 | -8.48 °C | -2.21 °C | 0 mm |
| February | -8.56 °C | -1.51 °C | 0 mm |
| March | -7.94 °C | 0.73 °C | 0 mm |
| April | -2.63 °C | 5.34 °C | 26 mm |
| May | 2.15 °C | 11.14 °C | 55 mm |
| June | 5.94 °C | 14.64 °C | 70 mm |
| July | 8.74 °C | 18.09 °C | 61 mm |
| August | 7.97 °C | 18.13 °C | 53 mm |
| September | 4.61 °C | 13.34 °C | 62 mm |
| October | 0.58 °C | 6.42 °C | 90 mm |
| November | -4.63 °C | -0.08 °C | 1 mm |
| December | -9.34 °C | -3.71 °C | 0 mm |
| Annual | -1 °C | 6.7 °C | 418 mm |
| 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 : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |