Cobalt, Ontario climate data is summarized below. Average annual temperatures range from -1.5 °C (low) to 8.4 °C (high). Annual precipitation averages 650 Millimeters. Cobalt is located in USDA Plant Hardiness Zone 3b. 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 | -18.23 °C | -8.72 °C | 0 mm |
| February | -18.06 °C | -8.12 °C | 0 mm |
| March | -11.03 °C | -0.77 °C | 5 mm |
| April | -2.98 °C | 7.19 °C | 49 mm |
| May | 4.65 °C | 16.91 °C | 69 mm |
| June | 10.21 °C | 21.57 °C | 78 mm |
| July | 12.9 °C | 23.59 °C | 103 mm |
| August | 12.3 °C | 22.59 °C | 107 mm |
| September | 7.56 °C | 17.91 °C | 89 mm |
| October | 2.17 °C | 10.3 °C | 110 mm |
| November | -3.92 °C | 3.09 °C | 40 mm |
| December | -13.09 °C | -5.26 °C | 0 mm |
| Annual | -1.5 °C | 8.4 °C | 650 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |