Red Rock, Ontario climate data is summarized below. Average annual temperatures range from -1.8 °C (low) to 6.6 °C (high). Annual precipitation averages 558 Millimeters. Red Rock is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -19.14 °C | -9.3 °C | 0 mm |
| February | -19.2 °C | -7.98 °C | 0 mm |
| March | -11.27 °C | -0.51 °C | 0 mm |
| April | -3.43 °C | 5.55 °C | 23 mm |
| May | 3.03 °C | 11.81 °C | 95 mm |
| June | 7.74 °C | 16.4 °C | 89 mm |
| July | 11.19 °C | 19.48 °C | 99 mm |
| August | 12.87 °C | 20.8 °C | 78 mm |
| September | 9.49 °C | 16.6 °C | 78 mm |
| October | 4.4 °C | 10.09 °C | 73 mm |
| November | -2.83 °C | 3 °C | 23 mm |
| December | -14.82 °C | -6.44 °C | 0 mm |
| Annual | -1.8 °C | 6.6 °C | 558 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Normal |