Onaping, Ontario climate data is summarized below. Average annual temperatures range from -1.6 °C (low) to 9.3 °C (high). Annual precipitation averages 588 Millimeters. Onaping 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.25 °C | -7.14 °C | 0 mm |
| February | -17.57 °C | -6.45 °C | 0 mm |
| March | -10.7 °C | 0.73 °C | 8 mm |
| April | -2.69 °C | 8.51 °C | 56 mm |
| May | 4.64 °C | 17.53 °C | 71 mm |
| June | 9.97 °C | 22.24 °C | 70 mm |
| July | 11.87 °C | 24.25 °C | 74 mm |
| August | 11.22 °C | 23.09 °C | 85 mm |
| September | 6.61 °C | 18.41 °C | 80 mm |
| October | 1.38 °C | 10.76 °C | 97 mm |
| November | -4.63 °C | 3.48 °C | 47 mm |
| December | -12.43 °C | -4.1 °C | 0 mm |
| Annual | -1.6 °C | 9.3 °C | 588 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |