Onoway, Alberta climate data is summarized below. Average annual temperatures range from -2 °C (low) to 8.7 °C (high). Annual precipitation averages 421 Millimeters. Onoway is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.16 °C | -5.83 °C | 0 mm |
| February | -13.38 °C | -4.12 °C | 0 mm |
| March | -9.07 °C | 0.63 °C | 0 mm |
| April | -2.13 °C | 8.73 °C | 31 mm |
| May | 3.81 °C | 17.05 °C | 76 mm |
| June | 8.45 °C | 20.93 °C | 86 mm |
| July | 11.21 °C | 23.68 °C | 108 mm |
| August | 9.66 °C | 22.97 °C | 51 mm |
| September | 4.92 °C | 18.59 °C | 37 mm |
| October | -0.19 °C | 10.38 °C | 32 mm |
| November | -7.67 °C | -0.85 °C | 0 mm |
| December | -15.88 °C | -7.88 °C | 0 mm |
| Annual | -2 °C | 8.7 °C | 421 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |