Dorset, Ontario climate data is summarized below. Average annual temperatures range from 30.8 °F (low) to 50.7 °F (high). Annual precipitation averages 25.9 Inches. 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 | -26.2 °F | -20.6 °F | 0 in. |
| February | -26.8 °F | -20.5 °F | 0 in. |
| March | -23 °F | -16.9 °F | 508 in. |
| April | -18.9 °F | -12.4 °F | 1574.8 in. |
| May | -15 °F | -7.6 °F | 1930.4 in. |
| June | -12.1 °F | -5.2 °F | 2108.2 in. |
| July | -10.9 °F | -4 °F | 2362.2 in. |
| August | -11.3 °F | -4.5 °F | 2235.2 in. |
| September | -13.8 °F | -7 °F | 2082.8 in. |
| October | -16.4 °F | -11.1 °F | 2590.8 in. |
| November | -19.9 °F | -15 °F | 1320.8 in. |
| December | -23.6 °F | -19.1 °F | 0 in. |
| Annual | 30.8 °F | 50.7 °F | 25.91 in. |
| 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 : -25°F to -20°F |
| Current Drought Conditions | Normal |