Acton, Ontario climate data is summarized below. Average annual temperatures range from 37.8 °F (low) to 54.3 °F (high). Annual precipitation averages 34.2 Inches. 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 | -23 °F | -19.1 °F | 355.6 in. |
| February | -23.6 °F | -19.2 °F | 355.6 in. |
| March | -20.5 °F | -15.4 °F | 1346.2 in. |
| April | -16.9 °F | -11.2 °F | 2184.4 in. |
| May | -13.4 °F | -7.3 °F | 2819.4 in. |
| June | -10.6 °F | -4.7 °F | 2692.4 in. |
| July | -9.1 °F | -3.1 °F | 2819.4 in. |
| August | -9.5 °F | -3.6 °F | 3073.4 in. |
| September | -11.7 °F | -5.9 °F | 2006.6 in. |
| October | -14.8 °F | -10 °F | 1905 in. |
| November | -18 °F | -13.7 °F | 1422.4 in. |
| December | -20.8 °F | -17.6 °F | 1117.6 in. |
| Annual | 37.8 °F | 54.3 °F | 34.24 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |