Thorsby, Alberta climate data is summarized below. Average annual temperatures range from -1.9 °C (low) to 8.7 °C (high). Annual precipitation averages 465 Millimeters. Thorsby is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.38 °C | -5.54 °C | 0 mm |
| February | -12.73 °C | -3.86 °C | 0 mm |
| March | -8.44 °C | 1.09 °C | 0 mm |
| April | -2.35 °C | 8.75 °C | 34 mm |
| May | 3.5 °C | 16.73 °C | 79 mm |
| June | 8.23 °C | 20.29 °C | 101 mm |
| July | 10.86 °C | 23.13 °C | 114 mm |
| August | 9.36 °C | 22.48 °C | 65 mm |
| September | 4.94 °C | 18.56 °C | 42 mm |
| October | -0.12 °C | 10.57 °C | 30 mm |
| November | -7.46 °C | -0.36 °C | 0 mm |
| December | -14.89 °C | -7.16 °C | 0 mm |
| Annual | -1.9 °C | 8.7 °C | 465 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |