Thetford Mines, Quebec climate data is summarized below. Average annual temperatures range from -0.7 °C (low) to 9.1 °C (high). Annual precipitation averages 124 Millimeters. Thetford Mines is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.89 °C | -6.36 °C | 0 mm |
| February | -15.57 °C | -5.93 °C | 0 mm |
| March | -9.93 °C | -0.15 °C | 0 mm |
| April | -2.15 °C | 7.67 °C | 14 mm |
| May | 5.18 °C | 16.61 °C | 16 mm |
| June | 10.11 °C | 20.96 °C | 13 mm |
| July | 12.97 °C | 23.61 °C | 22 mm |
| August | 12.2 °C | 22.59 °C | 18 mm |
| September | 7.69 °C | 18.45 °C | 9 mm |
| October | 2.35 °C | 11.11 °C | 16 mm |
| November | -3.82 °C | 4.17 °C | 12 mm |
| December | -11.39 °C | -3.52 °C | 4 mm |
| Annual | -0.7 °C | 9.1 °C | 124 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |