Listowel, Ontario climate data is summarized below. Average annual temperatures range from 2.3 °C (low) to 11.5 °C (high). Annual precipitation averages 345 Millimeters. Listowel 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 | -10.28 °C | -3.23 °C | 0 mm |
| February | -11.86 °C | -3.72 °C | 0 mm |
| March | -5.76 °C | 3.39 °C | 22 mm |
| April | 0.74 °C | 11.16 °C | 22 mm |
| May | 7.14 °C | 18.41 °C | 41 mm |
| June | 11.93 °C | 22.92 °C | 50 mm |
| July | 13.98 °C | 25.11 °C | 76 mm |
| August | 13.7 °C | 24.31 °C | 67 mm |
| September | 9.86 °C | 20.31 °C | 35 mm |
| October | 4.93 °C | 13.36 °C | 16 mm |
| November | -0.84 °C | 6.46 °C | 11 mm |
| December | -6.06 °C | -0.16 °C | 5 mm |
| Annual | 2.3 °C | 11.5 °C | 345 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |