Horsefly, British Columbia climate data is summarized below. Average annual temperatures range from 29.2 °F (low) to 47.9 °F (high). Annual precipitation averages 20.2 Inches. 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 | -24.1 °F | -19.5 °F | 0 in. |
| February | -23.2 °F | -17.8 °F | 152.4 in. |
| March | -21.6 °F | -15.9 °F | 406.4 in. |
| April | -19.5 °F | -13.3 °F | 1244.6 in. |
| May | -16.4 °F | -9.7 °F | 1701.8 in. |
| June | -14.3 °F | -7.9 °F | 2133.6 in. |
| July | -12.9 °F | -5.7 °F | 1676.4 in. |
| August | -13.3 °F | -5.7 °F | 1193.8 in. |
| September | -15.8 °F | -8.7 °F | 1651 in. |
| October | -17.8 °F | -12.9 °F | 1879.6 in. |
| November | -21 °F | -17.5 °F | 990.6 in. |
| December | -23.9 °F | -19.8 °F | 0 in. |
| Annual | 29.2 °F | 47.9 °F | 20.21 in. |
| 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 : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |