Mississauga, Ontario climate data is summarized below. Average annual temperatures range from 40.6 °F (low) to 55.6 °F (high). Annual precipitation averages 35.4 Inches. Mississauga is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -22.2 °F | -18.4 °F | 533.4 in. |
| February | -22.9 °F | -18.6 °F | 762 in. |
| March | -19.7 °F | -14.9 °F | 1828.8 in. |
| April | -16.2 °F | -11.1 °F | 2413 in. |
| May | -12.7 °F | -7.2 °F | 2463.8 in. |
| June | -9.7 °F | -4.4 °F | 2311.4 in. |
| July | -8.1 °F | -2.8 °F | 2463.8 in. |
| August | -8.4 °F | -3.2 °F | 2768.6 in. |
| September | -10.8 °F | -5.6 °F | 2032 in. |
| October | -14 °F | -9.6 °F | 2006.6 in. |
| November | -17.2 °F | -13.3 °F | 1803.4 in. |
| December | -20 °F | -16.8 °F | 1447.8 in. |
| Annual | 40.6 °F | 55.6 °F | 35.39 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |