Topley, British Columbia climate data is summarized below. Average annual temperatures range from -2 °C (low) to 6.7 °C (high). Annual precipitation averages 364 Millimeters. Topley is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.54 °C | -3.46 °C | 0 mm |
| February | -10.27 °C | -2.16 °C | 0 mm |
| March | -9.09 °C | 0.84 °C | 0 mm |
| April | -4.44 °C | 4.82 °C | 37 mm |
| May | 2.13 °C | 12.55 °C | 45 mm |
| June | 5.56 °C | 15.5 °C | 63 mm |
| July | 8.31 °C | 19.01 °C | 53 mm |
| August | 7.43 °C | 18.77 °C | 41 mm |
| September | 3.77 °C | 13.36 °C | 54 mm |
| October | -0.07 °C | 6.12 °C | 64 mm |
| November | -5.67 °C | -0.7 °C | 7 mm |
| December | -10.77 °C | -4.67 °C | 0 mm |
| Annual | -2 °C | 6.7 °C | 364 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |