Fort St. John, British Columbia climate data is summarized below. Average annual temperatures range from 26.7 °F (low) to 45.3 °F (high). Annual precipitation averages 14.4 Inches. Fort St. John is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -26.2 °F | -21.5 °F | 0 in. |
| February | -25.6 °F | -20.6 °F | 0 in. |
| March | -24.2 °F | -18.4 °F | 0 in. |
| April | -19.1 °F | -13.5 °F | 660.4 in. |
| May | -15.8 °F | -8.8 °F | 1117.6 in. |
| June | -13.2 °F | -6.6 °F | 2362.2 in. |
| July | -11.9 °F | -4.9 °F | 1752.6 in. |
| August | -12.6 °F | -5.4 °F | 1244.6 in. |
| September | -15 °F | -8.4 °F | 1168.4 in. |
| October | -18 °F | -13.5 °F | 990.6 in. |
| November | -23.8 °F | -19.7 °F | 0 in. |
| December | -27.7 °F | -23.1 °F | 0 in. |
| Annual | 26.7 °F | 45.3 °F | 14.41 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°F to -35°F |
| Current Drought Conditions | Normal |