Rocky Mountain House, Alberta climate data is summarized below. Average annual temperatures range from -3.1 °C (low) to 8.8 °C (high). Annual precipitation averages 456 Millimeters. Rocky Mountain House 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 Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.26 °C | -4.13 °C | 0 mm |
| February | -13.7 °C | -2.66 °C | 0 mm |
| March | -9.13 °C | 1.88 °C | 0 mm |
| April | -3.75 °C | 8.12 °C | 31 mm |
| May | 1.84 °C | 15.38 °C | 81 mm |
| June | 6.45 °C | 19.06 °C | 110 mm |
| July | 9.27 °C | 22.64 °C | 92 mm |
| August | 7.84 °C | 22.06 °C | 63 mm |
| September | 3.48 °C | 18.07 °C | 47 mm |
| October | -1.75 °C | 10.44 °C | 32 mm |
| November | -8.61 °C | 0.26 °C | 0 mm |
| December | -15.16 °C | -5.65 °C | 0 mm |
| Annual | -3.1 °C | 8.8 °C | 456 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| 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 | Moderate Drought |