Carleton Place, Ontario climate data is summarized below. Average annual temperatures range from 1.5 °C (low) to 11.7 °C (high). Annual precipitation averages 695 Millimeters. Carleton Place 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 | -13.26 °C | -4.3 °C | 4 mm |
| February | -13.32 °C | -3.63 °C | 1 mm |
| March | -7.16 °C | 3.1 °C | 24 mm |
| April | 0.78 °C | 11.84 °C | 56 mm |
| May | 7.37 °C | 19.72 °C | 76 mm |
| June | 12.52 °C | 23.62 °C | 111 mm |
| July | 14.78 °C | 26.02 °C | 125 mm |
| August | 13.93 °C | 25.02 °C | 113 mm |
| September | 9.35 °C | 20.55 °C | 77 mm |
| October | 4.16 °C | 13.28 °C | 58 mm |
| November | -1.88 °C | 6.33 °C | 31 mm |
| December | -8.89 °C | -1.59 °C | 19 mm |
| Annual | 1.5 °C | 11.7 °C | 695 mm |
| 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 : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |