Val Therese, Ontario climate data is summarized below. Average annual temperatures range from -1.5 °C (low) to 9.8 °C (high). Annual precipitation averages 621 Millimeters. Val Therese is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.95 °C | -6.93 °C | 0 mm |
| February | -17.46 °C | -6.13 °C | 0 mm |
| March | -10.3 °C | 1.44 °C | 10 mm |
| April | -2.36 °C | 9.31 °C | 55 mm |
| May | 4.68 °C | 18.16 °C | 71 mm |
| June | 10.04 °C | 22.84 °C | 77 mm |
| July | 11.95 °C | 24.94 °C | 82 mm |
| August | 11.38 °C | 23.72 °C | 98 mm |
| September | 6.68 °C | 19 °C | 83 mm |
| October | 1.5 °C | 11.26 °C | 101 mm |
| November | -4.43 °C | 3.99 °C | 44 mm |
| December | -12.18 °C | -3.83 °C | 0 mm |
| Annual | -1.5 °C | 9.8 °C | 621 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |