Prescott, Ontario climate data is summarized below. Average annual temperatures range from 36 °F (low) to 54.4 °F (high). Annual precipitation averages 21.9 Inches. 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 | -24.7 °F | -19.6 °F | 101.6 in. |
| February | -25 °F | -19.5 °F | 127 in. |
| March | -21.3 °F | -15.6 °F | 736.6 in. |
| April | -16.9 °F | -10.9 °F | 1447.8 in. |
| May | -13.4 °F | -6.8 °F | 1473.2 in. |
| June | -10.6 °F | -4.4 °F | 1727.2 in. |
| July | -9.2 °F | -3 °F | 2540 in. |
| August | -9.7 °F | -3.5 °F | 1905 in. |
| September | -12.2 °F | -5.8 °F | 1117.6 in. |
| October | -15.1 °F | -9.8 °F | 1549.4 in. |
| November | -18.3 °F | -13.7 °F | 914.4 in. |
| December | -22 °F | -18 °F | 482.6 in. |
| Annual | 36 °F | 54.4 °F | 21.89 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |