Stony Plain, Alberta climate data is summarized below. Average annual temperatures range from -2.1 °C (low) to 8.7 °C (high). Annual precipitation averages 433 Millimeters. Stony Plain is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.3 °C | -5.96 °C | 0 mm |
| February | -13.46 °C | -4.22 °C | 0 mm |
| March | -8.86 °C | 0.83 °C | 0 mm |
| April | -2.3 °C | 8.79 °C | 33 mm |
| May | 3.58 °C | 17.01 °C | 76 mm |
| June | 8.39 °C | 20.75 °C | 88 mm |
| July | 11.11 °C | 23.52 °C | 108 mm |
| August | 9.58 °C | 22.88 °C | 58 mm |
| September | 4.87 °C | 18.65 °C | 40 mm |
| October | -0.23 °C | 10.49 °C | 30 mm |
| November | -7.74 °C | -0.78 °C | 0 mm |
| December | -15.76 °C | -7.84 °C | 0 mm |
| Annual | -2.1 °C | 8.7 °C | 433 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |