Ridgetown, Ontario climate data is summarized below. Average annual temperatures range from 40.5 °F (low) to 56.4 °F (high). Annual precipitation averages 29.7 Inches. Ridgetown is located in USDA Plant Hardiness Zone 6b. 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 | -22.1 °F | -18.3 °F | 558.8 in. |
| February | -22.8 °F | -18.5 °F | 381 in. |
| March | -19.3 °F | -14.5 °F | 1320.8 in. |
| April | -16.2 °F | -10.6 °F | 1803.4 in. |
| May | -12.7 °F | -6.9 °F | 2184.4 in. |
| June | -9.7 °F | -4 °F | 2133.6 in. |
| July | -8.5 °F | -2.9 °F | 2794 in. |
| August | -8.8 °F | -3.3 °F | 1905 in. |
| September | -11.2 °F | -5.5 °F | 2006.6 in. |
| October | -14 °F | -9.1 °F | 1600.2 in. |
| November | -17.1 °F | -12.9 °F | 1397 in. |
| December | -19.7 °F | -16.4 °F | 1066.8 in. |
| Annual | 40.5 °F | 56.4 °F | 29.7 in. |
| 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 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |