Caledonia, Ontario climate data is summarized below. Average annual temperatures range from 3.9 °C (low) to 13.6 °C (high). Annual precipitation averages 914 Millimeters. Caledonia is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.27 °C | -0.9 °C | 31 mm |
| February | -9.72 °C | -1.3 °C | 33 mm |
| March | -3.84 °C | 5.64 °C | 86 mm |
| April | 2.02 °C | 12.84 °C | 97 mm |
| May | 8.08 °C | 20.04 °C | 105 mm |
| June | 13.54 °C | 24.86 °C | 82 mm |
| July | 15.89 °C | 27.44 °C | 96 mm |
| August | 15.28 °C | 26.49 °C | 84 mm |
| September | 11.15 °C | 22.2 °C | 78 mm |
| October | 5.93 °C | 15.27 °C | 87 mm |
| November | 0.22 °C | 8.46 °C | 67 mm |
| December | -4.09 °C | 2.23 °C | 68 mm |
| Annual | 3.9 °C | 13.6 °C | 914 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |