Freelton, Ontario climate data is summarized below. Average annual temperatures range from 3.6 °C (low) to 13.1 °C (high). Annual precipitation averages 954 Millimeters. Freelton 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 | -8.7 °C | -1.5 °C | 20 mm |
| February | -10.08 °C | -1.85 °C | 27 mm |
| March | -4.39 °C | 4.99 °C | 69 mm |
| April | 1.89 °C | 12.34 °C | 99 mm |
| May | 8.12 °C | 19.43 °C | 109 mm |
| June | 13.4 °C | 24.27 °C | 103 mm |
| July | 15.85 °C | 27.13 °C | 112 mm |
| August | 15.3 °C | 26.3 °C | 111 mm |
| September | 11.14 °C | 21.98 °C | 91 mm |
| October | 5.7 °C | 14.82 °C | 86 mm |
| November | -0.02 °C | 7.94 °C | 67 mm |
| December | -4.78 °C | 1.37 °C | 60 mm |
| Annual | 3.6 °C | 13.1 °C | 954 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 |