Red Rock, Ontario climate data is summarized below. Average annual temperatures range from 28.7 °F (low) to 43.9 °F (high). Annual precipitation averages 22 Inches. 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 | -28.4 °F | -22.9 °F | 0 in. |
| February | -28.4 °F | -22.2 °F | 0 in. |
| March | -24 °F | -18.1 °F | 0 in. |
| April | -19.7 °F | -14.7 °F | 584.2 in. |
| May | -16.1 °F | -11.2 °F | 2413 in. |
| June | -13.5 °F | -8.7 °F | 2260.6 in. |
| July | -11.6 °F | -7 °F | 2514.6 in. |
| August | -10.6 °F | -6.2 °F | 1981.2 in. |
| September | -12.5 °F | -8.6 °F | 1981.2 in. |
| October | -15.3 °F | -12.2 °F | 1854.2 in. |
| November | -19.4 °F | -16.1 °F | 584.2 in. |
| December | -26 °F | -21.4 °F | 0 in. |
| Annual | 28.7 °F | 43.9 °F | 21.97 in. |
| 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°F to -35°F |
| Current Drought Conditions | Normal |