Mission, British Columbia climate data is summarized below. Average annual temperatures range from 42.6 °F (low) to 56.9 °F (high). Annual precipitation averages 55.3 Inches. Mission 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18 °F | -15.2 °F | 4064 in. |
| February | -17.2 °F | -14 °F | 2921 in. |
| March | -16.7 °F | -12.7 °F | 4140.2 in. |
| April | -15.5 °F | -10.5 °F | 2108.2 in. |
| May | -13.4 °F | -8 °F | 1701.8 in. |
| June | -11.9 °F | -6.7 °F | 1371.6 in. |
| July | -10.5 °F | -4.5 °F | 1016 in. |
| August | -10.5 °F | -4.4 °F | 1143 in. |
| September | -11.9 °F | -6.4 °F | 2590.8 in. |
| October | -14.1 °F | -9.9 °F | 5410.2 in. |
| November | -16.4 °F | -13.3 °F | 5410.2 in. |
| December | -18 °F | -15.6 °F | 3759.2 in. |
| Annual | 42.6 °F | 56.9 °F | 55.26 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |