Mississauga, Ontario climate data is summarized below. Average annual temperatures range from 4.8 °C (low) to 13.1 °C (high). Annual precipitation averages 899 Millimeters. 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 | -7.95 °C | -1.09 °C | 21 mm |
| February | -9.15 °C | -1.43 °C | 30 mm |
| March | -3.45 °C | 5.13 °C | 72 mm |
| April | 2.92 °C | 12.02 °C | 95 mm |
| May | 9.19 °C | 19.06 °C | 97 mm |
| June | 14.6 °C | 24.04 °C | 91 mm |
| July | 17.45 °C | 26.9 °C | 97 mm |
| August | 16.96 °C | 26.17 °C | 109 mm |
| September | 12.56 °C | 21.93 °C | 80 mm |
| October | 6.88 °C | 14.73 °C | 79 mm |
| November | 0.99 °C | 8.13 °C | 71 mm |
| December | -3.99 °C | 1.77 °C | 57 mm |
| Annual | 4.8 °C | 13.1 °C | 899 mm |
| 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 : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |