Carstairs, Alberta climate data is summarized below. Average annual temperatures range from -1.8 °C (low) to 9.5 °C (high). Annual precipitation averages 444 Millimeters. Carstairs is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.89 °C | -2.37 °C | 0 mm |
| February | -11.38 °C | -1.82 °C | 0 mm |
| March | -7.04 °C | 2.96 °C | 0 mm |
| April | -2.67 °C | 8.7 °C | 34 mm |
| May | 2.83 °C | 15.58 °C | 83 mm |
| June | 7.29 °C | 19 °C | 122 mm |
| July | 9.92 °C | 22.39 °C | 82 mm |
| August | 8.56 °C | 21.81 °C | 53 mm |
| September | 4.42 °C | 18.1 °C | 44 mm |
| October | -0.88 °C | 11.1 °C | 26 mm |
| November | -7.58 °C | 2.35 °C | 0 mm |
| December | -13.41 °C | -4.17 °C | 0 mm |
| Annual | -1.8 °C | 9.5 °C | 444 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |