Acton, Ontario climate data is summarized below. Average annual temperatures range from 3.2 °C (low) to 12.4 °C (high). Annual precipitation averages 870 Millimeters. Acton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.43 °C | -2.34 °C | 14 mm |
| February | -10.51 °C | -2.6 °C | 14 mm |
| March | -4.96 °C | 4.27 °C | 53 mm |
| April | 1.54 °C | 11.79 °C | 86 mm |
| May | 7.96 °C | 18.94 °C | 111 mm |
| June | 13.01 °C | 23.59 °C | 106 mm |
| July | 15.54 °C | 26.36 °C | 111 mm |
| August | 14.95 °C | 25.54 °C | 121 mm |
| September | 10.88 °C | 21.3 °C | 79 mm |
| October | 5.39 °C | 14.07 °C | 75 mm |
| November | -0.39 °C | 7.29 °C | 56 mm |
| December | -5.41 °C | 0.41 °C | 44 mm |
| Annual | 3.2 °C | 12.4 °C | 870 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |