Roy, British Columbia climate data is summarized below. Average annual temperatures range from 40.3 °F (low) to 56.8 °F (high). Annual precipitation averages 62.5 Inches. Roy is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.4 °F | -15.4 °F | 4394.2 in. |
| February | -17.9 °F | -14.3 °F | 3149.6 in. |
| March | -17.4 °F | -13.2 °F | 4216.4 in. |
| April | -16.4 °F | -10.8 °F | 2768.6 in. |
| May | -14.2 °F | -7.8 °F | 1727.2 in. |
| June | -12.8 °F | -6.2 °F | 1397 in. |
| July | -11.4 °F | -4 °F | 1016 in. |
| August | -11.4 °F | -3.9 °F | 1346.2 in. |
| September | -12.8 °F | -6.4 °F | 3327.4 in. |
| October | -14.7 °F | -10.2 °F | 5867.4 in. |
| November | -16.9 °F | -13.7 °F | 6502.4 in. |
| December | -18.5 °F | -15.7 °F | 4622.8 in. |
| Annual | 40.3 °F | 56.8 °F | 62.53 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |