Williams Lake, British Columbia climate data is summarized below. Average annual temperatures range from -0.7 °C (low) to 10.3 °C (high). Annual precipitation averages 421 Millimeters. 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 | -10.7 °C | -2.65 °C | 0 mm |
| February | -9.54 °C | 0.49 °C | 7 mm |
| March | -6.28 °C | 4.66 °C | 9 mm |
| April | -1.56 °C | 10.52 °C | 37 mm |
| May | 3.5 °C | 16.36 °C | 58 mm |
| June | 7.29 °C | 19.55 °C | 74 mm |
| July | 10.08 °C | 23.85 °C | 59 mm |
| August | 9.06 °C | 23.73 °C | 39 mm |
| September | 4.54 °C | 18.23 °C | 50 mm |
| October | 0.55 °C | 10.6 °C | 52 mm |
| November | -5.11 °C | 1.59 °C | 36 mm |
| December | -10.35 °C | -3.1 °C | 0 mm |
| Annual | -0.7 °C | 10.3 °C | 421 mm |
| 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 : -28.9°C to -26.1°C |
| Current Drought Conditions | Moderate Drought |