Simcoe, Ontario climate data is summarized below. Average annual temperatures range from 39.1 °F (low) to 56.2 °F (high). Annual precipitation averages 21.7 Inches. 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 | -22.3 °F | -18.2 °F | 355.6 in. |
| February | -23.2 °F | -18.5 °F | 228.6 in. |
| March | -19.8 °F | -14.6 °F | 914.4 in. |
| April | -16.7 °F | -10.7 °F | 1168.4 in. |
| May | -13.2 °F | -6.9 °F | 1549.4 in. |
| June | -10.2 °F | -4.2 °F | 1574.8 in. |
| July | -9 °F | -2.9 °F | 2159 in. |
| August | -9.3 °F | -3.3 °F | 1955.8 in. |
| September | -11.6 °F | -5.6 °F | 1549.4 in. |
| October | -14.4 °F | -9.3 °F | 1117.6 in. |
| November | -17.5 °F | -13 °F | 838.2 in. |
| December | -19.9 °F | -16.4 °F | 584.2 in. |
| Annual | 39.1 °F | 56.2 °F | 21.69 in. |
| 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 : -5°F to 0°F |
| Current Drought Conditions | Normal |