Topley, British Columbia climate data is summarized below. Average annual temperatures range from 28.5 °F (low) to 44 °F (high). Annual precipitation averages 14.3 Inches. 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 | -23.6 °F | -19.7 °F | 0 in. |
| February | -23.5 °F | -19 °F | 0 in. |
| March | -22.8 °F | -17.3 °F | 0 in. |
| April | -20.2 °F | -15.1 °F | 939.8 in. |
| May | -16.6 °F | -10.8 °F | 1143 in. |
| June | -14.7 °F | -9.2 °F | 1600.2 in. |
| July | -13.2 °F | -7.2 °F | 1346.2 in. |
| August | -13.7 °F | -7.4 °F | 1041.4 in. |
| September | -15.7 °F | -10.4 °F | 1371.6 in. |
| October | -17.8 °F | -14.4 °F | 1625.6 in. |
| November | -20.9 °F | -18.2 °F | 177.8 in. |
| December | -23.8 °F | -20.4 °F | 0 in. |
| Annual | 28.5 °F | 44 °F | 14.34 in. |
| 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 : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |