Petawawa, Ontario climate data is summarized below. Average annual temperatures range from 0.1 °C (low) to 11 °C (high). Annual precipitation averages 631 Millimeters. Petawawa is located in USDA Plant Hardiness Zone 4b. 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 | -15.81 °C | -5.85 °C | 0 mm |
| February | -15.8 °C | -4.72 °C | 0 mm |
| March | -9.01 °C | 2.45 °C | 21 mm |
| April | -0.59 °C | 11.2 °C | 59 mm |
| May | 6.06 °C | 19.29 °C | 77 mm |
| June | 11.3 °C | 23.71 °C | 81 mm |
| July | 13.76 °C | 26 °C | 99 mm |
| August | 13.06 °C | 24.89 °C | 91 mm |
| September | 8.33 °C | 20.24 °C | 81 mm |
| October | 3.22 °C | 12.71 °C | 81 mm |
| November | -2.84 °C | 5.44 °C | 41 mm |
| December | -10.71 °C | -2.92 °C | 0 mm |
| Annual | 0.1 °C | 11 °C | 631 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |