Calgary, Alberta climate data is summarized below. Average annual temperatures range from -0.6 °C (low) to 11 °C (high). Annual precipitation averages 401 Millimeters. Calgary is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11 °C | -0.83 °C | 0 mm |
| February | -10.26 °C | -0.07 °C | 0 mm |
| March | -5.95 °C | 4.86 °C | 0 mm |
| April | -1.42 °C | 10.32 °C | 27 mm |
| May | 4.04 °C | 16.57 °C | 80 mm |
| June | 8.46 °C | 20.38 °C | 106 mm |
| July | 11.62 °C | 24.15 °C | 67 mm |
| August | 10.19 °C | 23.44 °C | 46 mm |
| September | 5.58 °C | 19.39 °C | 42 mm |
| October | 0.49 °C | 12.27 °C | 33 mm |
| November | -6.29 °C | 3.65 °C | 0 mm |
| December | -12.46 °C | -2.69 °C | 0 mm |
| Annual | -0.6 °C | 11 °C | 401 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |