Fennells Corner, Ontario climate data is summarized below. Average annual temperatures range from 2.4 °C (low) to 12.1 °C (high). Annual precipitation averages 741 Millimeters. Fennells Corner is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.3 °C | -2.57 °C | 9 mm |
| February | -11.57 °C | -3 °C | 0 mm |
| March | -6.16 °C | 3.75 °C | 36 mm |
| April | 0.77 °C | 11.5 °C | 61 mm |
| May | 7.01 °C | 19.19 °C | 93 mm |
| June | 12.11 °C | 23.66 °C | 104 mm |
| July | 14.78 °C | 26.2 °C | 142 mm |
| August | 14.18 °C | 25.2 °C | 114 mm |
| September | 9.96 °C | 20.84 °C | 67 mm |
| October | 4.91 °C | 13.65 °C | 52 mm |
| November | -1.02 °C | 6.95 °C | 39 mm |
| December | -6.23 °C | 0.22 °C | 24 mm |
| Annual | 2.4 °C | 12.1 °C | 741 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |