Legal, Alberta climate data is summarized below. Average annual temperatures range from 28.7 °F (low) to 47.3 °F (high). Annual precipitation averages 16.1 Inches. Legal is located in USDA Plant Hardiness Zone 3b. 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 °F | -21.2 °F | 0 in. |
| February | -25.5 °F | -20.4 °F | 0 in. |
| March | -23.1 °F | -17.8 °F | 0 in. |
| April | -18.8 °F | -13.1 °F | 889 in. |
| May | -15.3 °F | -8.3 °F | 1727.2 in. |
| June | -12.6 °F | -6 °F | 1955.8 in. |
| July | -11.1 °F | -4.5 °F | 2794 in. |
| August | -11.9 °F | -4.9 °F | 1295.4 in. |
| September | -14.7 °F | -7.5 °F | 965.2 in. |
| October | -17.6 °F | -12.2 °F | 762 in. |
| November | -22.1 °F | -18.4 °F | 0 in. |
| December | -26.7 °F | -22.3 °F | 0 in. |
| Annual | 28.7 °F | 47.3 °F | 16.11 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 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |