Prescott, Ontario climate data is summarized below. Average annual temperatures range from 2.2 °C (low) to 12.4 °C (high). Annual precipitation averages 556 Millimeters. Prescott is located in USDA Plant Hardiness Zone 5b. 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 | -12.45 °C | -3.26 °C | 4 mm |
| February | -12.93 °C | -3.06 °C | 5 mm |
| March | -6.26 °C | 3.85 °C | 29 mm |
| April | 1.54 °C | 12.46 °C | 57 mm |
| May | 7.81 °C | 19.83 °C | 58 mm |
| June | 12.87 °C | 24.04 °C | 68 mm |
| July | 15.38 °C | 26.63 °C | 100 mm |
| August | 14.54 °C | 25.74 °C | 75 mm |
| September | 9.97 °C | 21.57 °C | 44 mm |
| October | 4.83 °C | 14.34 °C | 61 mm |
| November | -1 °C | 7.37 °C | 36 mm |
| December | -7.63 °C | -0.45 °C | 19 mm |
| Annual | 2.2 °C | 12.4 °C | 556 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |