Shannonville, Ontario climate data is summarized below. Average annual temperatures range from 2.7 °C (low) to 13.4 °C (high). Annual precipitation averages 706 Millimeters. Shannonville 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.96 °C | -1.96 °C | 12 mm |
| February | -12.01 °C | -2.02 °C | 7 mm |
| March | -5.56 °C | 4.91 °C | 39 mm |
| April | 1.7 °C | 13.15 °C | 66 mm |
| May | 8.11 °C | 20.81 °C | 80 mm |
| June | 13.37 °C | 25.16 °C | 95 mm |
| July | 15.69 °C | 27.58 °C | 121 mm |
| August | 14.82 °C | 26.59 °C | 97 mm |
| September | 9.95 °C | 22.18 °C | 58 mm |
| October | 4.85 °C | 14.95 °C | 61 mm |
| November | -1.11 °C | 8.06 °C | 40 mm |
| December | -6.68 °C | 0.9 °C | 30 mm |
| Annual | 2.7 °C | 13.4 °C | 706 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |