Grassy Plains, British Columbia climate data is summarized below. Average annual temperatures range from 26.8 °F (low) to 42.3 °F (high). Annual precipitation averages 14 Inches. Grassy Plains is located in USDA Plant Hardiness Zone 3b. 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 | -24.3 °F | -20.3 °F | 0 in. |
| February | -24.1 °F | -19.4 °F | 0 in. |
| March | -23.1 °F | -17.9 °F | 0 in. |
| April | -20.7 °F | -15.8 °F | 838.2 in. |
| May | -17.3 °F | -11.5 °F | 1143 in. |
| June | -15.4 °F | -9.9 °F | 1701.8 in. |
| July | -13.8 °F | -8 °F | 1498.6 in. |
| August | -14.1 °F | -8 °F | 1143 in. |
| September | -16.1 °F | -10.6 °F | 1143 in. |
| October | -18.3 °F | -14.6 °F | 1422.4 in. |
| November | -21.3 °F | -18.4 °F | 127 in. |
| December | -24.1 °F | -20.7 °F | 0 in. |
| Annual | 26.8 °F | 42.3 °F | 13.97 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 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |