Sudbury, Ontario climate data is summarized below. Average annual temperatures range from 31.2 °F (low) to 50.5 °F (high). Annual precipitation averages 24.2 Inches. Sudbury 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 | -26.8 °F | -21.4 °F | 0 in. |
| February | -27 °F | -21 °F | 0 in. |
| March | -23.1 °F | -16.8 °F | 355.6 in. |
| April | -18.6 °F | -12.2 °F | 1549.4 in. |
| May | -14.6 °F | -7.5 °F | 1828.8 in. |
| June | -11.6 °F | -4.9 °F | 1828.8 in. |
| July | -10.3 °F | -3.7 °F | 1803.4 in. |
| August | -10.7 °F | -4.3 °F | 2336.8 in. |
| September | -13.3 °F | -7 °F | 2032 in. |
| October | -16.4 °F | -11.3 °F | 2616.2 in. |
| November | -19.7 °F | -15.3 °F | 1168.4 in. |
| December | -24.1 °F | -19.7 °F | 76.2 in. |
| Annual | 31.2 °F | 50.5 °F | 24.17 in. |
| 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 : -25°F to -20°F |
| Current Drought Conditions | Normal |