Galt, Ontario climate data is summarized below. Average annual temperatures range from 3.1 °C (low) to 12.8 °C (high). Annual precipitation averages 898 Millimeters. Galt 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.16 °C | -1.91 °C | 15 mm |
| February | -10.55 °C | -2.25 °C | 18 mm |
| March | -4.81 °C | 4.93 °C | 57 mm |
| April | 1.48 °C | 12.38 °C | 87 mm |
| May | 7.8 °C | 19.49 °C | 100 mm |
| June | 12.92 °C | 24.07 °C | 115 mm |
| July | 15.04 °C | 26.65 °C | 133 mm |
| August | 14.39 °C | 25.76 °C | 105 mm |
| September | 10.3 °C | 21.52 °C | 92 mm |
| October | 5.13 °C | 14.57 °C | 77 mm |
| November | -0.45 °C | 7.63 °C | 53 mm |
| December | -5.19 °C | 1.13 °C | 46 mm |
| Annual | 3.1 °C | 12.8 °C | 898 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |