Kitchener, Ontario climate data is summarized below. Average annual temperatures range from 2.6 °C (low) to 12.2 °C (high). Annual precipitation averages 808 Millimeters. Kitchener is located in USDA Plant Hardiness Zone 5b. 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 | -9.82 °C | -2.55 °C | 8 mm |
| February | -11.4 °C | -2.91 °C | 8 mm |
| March | -5.54 °C | 4.32 °C | 42 mm |
| April | 1.05 °C | 11.86 °C | 70 mm |
| May | 7.41 °C | 19.02 °C | 94 mm |
| June | 12.44 °C | 23.62 °C | 107 mm |
| July | 14.57 °C | 25.91 °C | 132 mm |
| August | 13.88 °C | 24.93 °C | 125 mm |
| September | 9.89 °C | 20.8 °C | 86 mm |
| October | 4.83 °C | 13.91 °C | 64 mm |
| November | -0.76 °C | 7.06 °C | 41 mm |
| December | -5.54 °C | 0.51 °C | 31 mm |
| Annual | 2.6 °C | 12.2 °C | 808 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |