Williams Lake, British Columbia climate data is summarized below. Average annual temperatures range from 30.7 °F (low) to 50.6 °F (high). Annual precipitation averages 16.6 Inches. Williams Lake is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -23.7 °F | -19.3 °F | 0 in. |
| February | -23.1 °F | -17.5 °F | 177.8 in. |
| March | -21.3 °F | -15.2 °F | 228.6 in. |
| April | -18.6 °F | -11.9 °F | 939.8 in. |
| May | -15.8 °F | -8.7 °F | 1473.2 in. |
| June | -13.7 °F | -6.9 °F | 1879.6 in. |
| July | -12.2 °F | -4.5 °F | 1498.6 in. |
| August | -12.7 °F | -4.6 °F | 990.6 in. |
| September | -15.3 °F | -7.7 °F | 1270 in. |
| October | -17.5 °F | -11.9 °F | 1320.8 in. |
| November | -20.6 °F | -16.9 °F | 914.4 in. |
| December | -23.5 °F | -19.5 °F | 0 in. |
| Annual | 30.7 °F | 50.6 °F | 16.58 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |