Almonte, Ontario climate data is summarized below. Average annual temperatures range from 35.1 °F (low) to 53.2 °F (high). Annual precipitation averages 25.6 Inches. Almonte is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -25.1 °F | -20.1 °F | 50.8 in. |
| February | -25.1 °F | -19.7 °F | 0 in. |
| March | -21.6 °F | -16 °F | 533.4 in. |
| April | -17.2 °F | -11 °F | 1219.2 in. |
| May | -13.6 °F | -6.7 °F | 1651 in. |
| June | -10.8 °F | -4.5 °F | 2641.6 in. |
| July | -9.5 °F | -3.3 °F | 3200.4 in. |
| August | -9.9 °F | -3.9 °F | 3048 in. |
| September | -12.5 °F | -6.4 °F | 1778 in. |
| October | -15.4 °F | -10.4 °F | 1295.4 in. |
| November | -18.7 °F | -14.2 °F | 660.4 in. |
| December | -22.6 °F | -18.6 °F | 431.8 in. |
| Annual | 35.1 °F | 53.2 °F | 25.59 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |