Goderich, Ontario climate data is summarized below. Average annual temperatures range from 4.8 °C (low) to 11.3 °C (high). Annual precipitation averages 301 Millimeters. Goderich is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.84 °C | -1.33 °C | 4 mm |
| February | -8.62 °C | -2.36 °C | 0 mm |
| March | -3.74 °C | 3.24 °C | 9 mm |
| April | 1.9 °C | 9.48 °C | 21 mm |
| May | 7.56 °C | 15.29 °C | 44 mm |
| June | 12.87 °C | 20.11 °C | 56 mm |
| July | 16.31 °C | 23.25 °C | 50 mm |
| August | 16.55 °C | 23.26 °C | 49 mm |
| September | 12.94 °C | 20.09 °C | 29 mm |
| October | 8.27 °C | 14.29 °C | 18 mm |
| November | 2.6 °C | 8.02 °C | 13 mm |
| December | -2.71 °C | 2.08 °C | 8 mm |
| Annual | 4.8 °C | 11.3 °C | 301 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |