Dorset, Ontario climate data is summarized below. Average annual temperatures range from -0.7 °C (low) to 10.4 °C (high). Annual precipitation averages 658 Millimeters. Dorset is located in USDA Plant Hardiness Zone 4b. 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 | -15.14 °C | -5.05 °C | 0 mm |
| February | -16.18 °C | -4.89 °C | 0 mm |
| March | -9.32 °C | 1.58 °C | 20 mm |
| April | -2.06 °C | 9.7 °C | 62 mm |
| May | 4.97 °C | 18.29 °C | 76 mm |
| June | 10.27 °C | 22.66 °C | 83 mm |
| July | 12.37 °C | 24.77 °C | 93 mm |
| August | 11.66 °C | 23.86 °C | 88 mm |
| September | 7.15 °C | 19.32 °C | 82 mm |
| October | 2.48 °C | 12.01 °C | 102 mm |
| November | -3.86 °C | 4.96 °C | 52 mm |
| December | -10.54 °C | -2.4 °C | 0 mm |
| Annual | -0.7 °C | 10.4 °C | 658 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |