Caledonia, Ontario climate data is summarized below. Average annual temperatures range from 38.9 °F (low) to 56.5 °F (high). Annual precipitation averages 36 Inches. 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 | -22.4 °F | -18.3 °F | 787.4 in. |
| February | -23.2 °F | -18.5 °F | 838.2 in. |
| March | -19.9 °F | -14.6 °F | 2184.4 in. |
| April | -16.7 °F | -10.6 °F | 2463.8 in. |
| May | -13.3 °F | -6.6 °F | 2667 in. |
| June | -10.3 °F | -4 °F | 2082.8 in. |
| July | -9 °F | -2.5 °F | 2438.4 in. |
| August | -9.3 °F | -3.1 °F | 2133.6 in. |
| September | -11.6 °F | -5.4 °F | 1981.2 in. |
| October | -14.5 °F | -9.3 °F | 2209.8 in. |
| November | -17.7 °F | -13.1 °F | 1701.8 in. |
| December | -20.1 °F | -16.5 °F | 1727.2 in. |
| Annual | 38.9 °F | 56.5 °F | 36 in. |
| 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 : -5°F to 0°F |
| Current Drought Conditions | Normal |