Castor, Alberta climate data is summarized below. Average annual temperatures range from 27.7 °F (low) to 47.8 °F (high). Annual precipitation averages 17.1 Inches. Castor 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 | -26.3 °F | -21.6 °F | 0 in. |
| February | -25.9 °F | -20.9 °F | 0 in. |
| March | -22.6 °F | -17.2 °F | 0 in. |
| April | -19.3 °F | -12.8 °F | 838.2 in. |
| May | -15.8 °F | -8.1 °F | 1498.6 in. |
| June | -13 °F | -6.1 °F | 2819.4 in. |
| July | -11.5 °F | -4.3 °F | 2362.2 in. |
| August | -12.4 °F | -4.7 °F | 1778 in. |
| September | -15 °F | -7.2 °F | 1066.8 in. |
| October | -18.1 °F | -11.7 °F | 660.4 in. |
| November | -22.5 °F | -18 °F | 0 in. |
| December | -26.8 °F | -22.3 °F | 0 in. |
| Annual | 27.7 °F | 47.8 °F | 17.08 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |