Simcoe, Ontario climate data is summarized below. Average annual temperatures range from 4 °C (low) to 13.4 °C (high). Annual precipitation averages 551 Millimeters. Simcoe is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.08 °C | -0.83 °C | 14 mm |
| February | -9.72 °C | -1.34 °C | 9 mm |
| March | -3.7 °C | 5.74 °C | 36 mm |
| April | 1.98 °C | 12.72 °C | 46 mm |
| May | 8.19 °C | 19.53 °C | 61 mm |
| June | 13.59 °C | 24.48 °C | 62 mm |
| July | 15.76 °C | 26.8 °C | 85 mm |
| August | 15.2 °C | 26 °C | 77 mm |
| September | 11.2 °C | 21.9 °C | 61 mm |
| October | 6.12 °C | 15.26 °C | 44 mm |
| November | 0.57 °C | 8.6 °C | 33 mm |
| December | -3.83 °C | 2.43 °C | 23 mm |
| Annual | 4 °C | 13.4 °C | 551 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |