Horsefly, British Columbia climate data is summarized below. Average annual temperatures range from -1.6 °C (low) to 8.8 °C (high). Annual precipitation averages 513 Millimeters. Horsefly is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 1 - Aug. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.32 °C | -3.12 °C | 0 mm |
| February | -9.82 °C | -0.08 °C | 6 mm |
| March | -6.91 °C | 3.44 °C | 16 mm |
| April | -3.05 °C | 8.13 °C | 49 mm |
| May | 2.47 °C | 14.57 °C | 67 mm |
| June | 6.24 °C | 17.71 °C | 84 mm |
| July | 8.85 °C | 21.81 °C | 66 mm |
| August | 8.04 °C | 21.66 °C | 47 mm |
| September | 3.65 °C | 16.32 °C | 65 mm |
| October | 0 °C | 8.8 °C | 74 mm |
| November | -5.75 °C | 0.55 °C | 39 mm |
| December | -11 °C | -3.67 °C | 0 mm |
| Annual | -1.6 °C | 8.8 °C | 513 mm |
| Average First Frost Date | Aug. 1 - Aug. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |