Chemainus, British Columbia climate data is summarized below. Average annual temperatures range from 44.4 °F (low) to 56.3 °F (high). Annual precipitation averages 62.9 Inches. Chemainus is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.9 °F | -14.5 °F | 5334 in. |
| February | -16.4 °F | -13.6 °F | 3657.6 in. |
| March | -16 °F | -12.8 °F | 4064 in. |
| April | -15 °F | -10.9 °F | 2006.6 in. |
| May | -13 °F | -8.6 °F | 1676.4 in. |
| June | -11.6 °F | -7.3 °F | 1193.8 in. |
| July | -10.2 °F | -5.3 °F | 787.4 in. |
| August | -10.1 °F | -5.3 °F | 1041.4 in. |
| September | -11.7 °F | -7.3 °F | 2413 in. |
| October | -13.8 °F | -10.4 °F | 6019.8 in. |
| November | -15.7 °F | -12.9 °F | 6959.6 in. |
| December | -17 °F | -14.7 °F | 5410.2 in. |
| Annual | 44.4 °F | 56.3 °F | 62.88 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |