Onoway, Alberta climate data is summarized below. Average annual temperatures range from 28.4 °F (low) to 47.6 °F (high). Annual precipitation averages 16.6 Inches. 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 | -25.6 °F | -21 °F | 0 in. |
| February | -25.2 °F | -20.1 °F | 0 in. |
| March | -22.8 °F | -17.4 °F | 0 in. |
| April | -19 °F | -12.9 °F | 787.4 in. |
| May | -15.7 °F | -8.3 °F | 1930.4 in. |
| June | -13.1 °F | -6.2 °F | 2184.4 in. |
| July | -11.6 °F | -4.6 °F | 2743.2 in. |
| August | -12.4 °F | -5 °F | 1295.4 in. |
| September | -15 °F | -7.5 °F | 939.8 in. |
| October | -17.9 °F | -12 °F | 812.8 in. |
| November | -22 °F | -18.3 °F | 0 in. |
| December | -26.6 °F | -22.2 °F | 0 in. |
| Annual | 28.4 °F | 47.6 °F | 16.58 in. |
| 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 : -30°F to -25°F |
| Current Drought Conditions | Normal |