Hespeler, Ontario climate data is summarized below. Average annual temperatures range from 2.9 °C (low) to 12.8 °C (high). Annual precipitation averages 869 Millimeters. Hespeler 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 | -9.39 °C | -2.04 °C | 11 mm |
| February | -10.84 °C | -2.38 °C | 13 mm |
| March | -5.02 °C | 4.79 °C | 50 mm |
| April | 1.37 °C | 12.43 °C | 84 mm |
| May | 7.67 °C | 19.53 °C | 104 mm |
| June | 12.75 °C | 24.15 °C | 112 mm |
| July | 14.91 °C | 26.66 °C | 122 mm |
| August | 14.23 °C | 25.78 °C | 118 mm |
| September | 10.18 °C | 21.59 °C | 90 mm |
| October | 5.04 °C | 14.52 °C | 73 mm |
| November | -0.55 °C | 7.62 °C | 50 mm |
| December | -5.31 °C | 0.92 °C | 42 mm |
| Annual | 2.9 °C | 12.8 °C | 869 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 |