Courtice, Ontario climate data is summarized below. Average annual temperatures range from 4 °C (low) to 12.6 °C (high). Annual precipitation averages 941 Millimeters. Courtice is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.11 °C | -0.89 °C | 26 mm |
| February | -9.34 °C | -1.32 °C | 24 mm |
| March | -3.88 °C | 4.58 °C | 74 mm |
| April | 2.28 °C | 11.29 °C | 108 mm |
| May | 8.04 °C | 17.96 °C | 95 mm |
| June | 13.35 °C | 22.81 °C | 105 mm |
| July | 16.11 °C | 25.84 °C | 97 mm |
| August | 15.71 °C | 25.27 °C | 103 mm |
| September | 11.53 °C | 21.11 °C | 71 mm |
| October | 6.3 °C | 14.3 °C | 89 mm |
| November | 0.5 °C | 7.95 °C | 76 mm |
| December | -4.36 °C | 1.73 °C | 73 mm |
| Annual | 4 °C | 12.6 °C | 941 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |