Terrace Bay, Ontario climate data is summarized below. Average annual temperatures range from -1.4 °C (low) to 5.7 °C (high). Annual precipitation averages 556 Millimeters. Terrace Bay 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 | -17.51 °C | -8.48 °C | 0 mm |
| February | -17.88 °C | -7.82 °C | 0 mm |
| March | -10.63 °C | -1.05 °C | 0 mm |
| April | -3.17 °C | 4.46 °C | 24 mm |
| May | 3.01 °C | 9.96 °C | 78 mm |
| June | 7.37 °C | 14.13 °C | 89 mm |
| July | 10.55 °C | 16.37 °C | 96 mm |
| August | 12.61 °C | 18.07 °C | 72 mm |
| September | 9.54 °C | 15.24 °C | 85 mm |
| October | 4.28 °C | 9.45 °C | 78 mm |
| November | -2.64 °C | 2.73 °C | 34 mm |
| December | -12.9 °C | -5.31 °C | 0 mm |
| Annual | -1.4 °C | 5.7 °C | 556 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |