Hearst, Ontario climate data is summarized below. Average annual temperatures range from 24.7 °F (low) to 44.9 °F (high). Annual precipitation averages 24.5 Inches. Hearst is located in USDA Plant Hardiness Zone 2a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -30.2 °F | -24.1 °F | 0 in. |
| February | -30.3 °F | -23.3 °F | 0 in. |
| March | -26.2 °F | -18.9 °F | 0 in. |
| April | -21.2 °F | -14.6 °F | 457.2 in. |
| May | -16.5 °F | -9.1 °F | 2159 in. |
| June | -13 °F | -5.6 °F | 2667 in. |
| July | -11 °F | -4.6 °F | 2870.2 in. |
| August | -11.6 °F | -5 °F | 2616.2 in. |
| September | -14.3 °F | -8.1 °F | 2667 in. |
| October | -17.4 °F | -12.8 °F | 1879.6 in. |
| November | -21.4 °F | -17.2 °F | 457.2 in. |
| December | -27.3 °F | -22.4 °F | 0 in. |
| Annual | 24.7 °F | 44.9 °F | 24.45 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 2a : -50°F to -45°F |
| Current Drought Conditions | Normal |